To beat the game for 100%, you have to complete all Monster Hunt missions in order to open all necessary leaders.

While the game doesn't have any kind of story mode, this guide might contain spoilers still, so if you want just to enjoy the game first, go on, and leave this page for a while :)

Btw, sorry for any mistakes, english is not my native language.

P.S. You can use Ctrl+F to find achievements names on the page.

Novice Emperor
Win vs AI Players on Easy difficulty on any map


Imperial Blood
Win vs AI Players on Normal difficulty on any map


Wise Emperor
Win vs AI Players on Hard difficulty on any map


Resilient Emperor
Win vs AI Players on Extreme difficulty on any map


Ultimate Emperor
Win vs AI Players on Nightmare difficulty on any map



Update!:

Thanks for this thread: https://steamhost.cn/steamcommunity_com/app/834740/discussions/0/1746720717340514614/

Did everything as author mentioned, the game was pretty easy, I killed all enemy forces even before wiped all other islands and got that achievement on another account.

----- Old, but also working:
While first three achievements are quiet easy to get for any unexperienced player, the two remaining are really rough. I tried many options, but got achievement with this one, which still requires some fast build/development skill and a bit of luck:


Tips:

• Don't forget to create new save file after every succesful step.
  
• Start the game with Wyona the Water Queen. I chose her because of hoping that enemy forces would go slowly through water, which would win some time; not sure if it really helped, but here we are.
  
• Get as many frogs workers as you can from the start, then just buy Evil Murmaids for food and Wooden Towers for wood. Build only your island.
  
• In my case, the enemy group have spawned just on the left one, but haven't enough courage to attack me, so I just waited and waited, silently deveoping, while he started to attack the only uncovered isle.
  
• When he got all his forces busy I took his base. Just buy workers there, don't build towers; He have another land now, all you need, is to get as many recourses from two island now, and keep build the towers and evil murmaids on first of yours.
  
• So there was moment when he hadn't enough courage to attack my very first island, which was still 2-3k forces worse that his.
  
• He reached some inner limit probably or something, and stuck at 5k forces. I've waited when I'll have at least 500-1k more, and started to move my murmaid army from one island to another. This made him also move his forces but with kinda delay.
  
• When you'll have the right timing, while his main army is still on another island, attack the closest one. No matter what, you have to attack all the building first, or you'll end up with army of dragons which he'll buy eventually.
  
• If you made it right, army of murmaids will crush his building while his army was on another island. Of course they'll run to help, but murmaids will ready to meet him, along with your towers.
  
• You might fail there couple of times - don't forget to save before and simply reload, and try a bit different rush tactic.
  
• Eventually you'll end with all his main army destroyed, and almost full yours. Just finish the last island shich will have about 500 forces or so.

Provincial Expander
Win Full Conquest mode on Normal difficulty on any map



Imperial Tactician
Win Full Conquest mode on Hard difficulty on any map



Imperial Expert Tactician
Win Full Conquest mode on Extreme difficulty on any map



Imperial Wizard Tactician
Win Full Conquest mode on Nightmare difficulty on any map



Masterful Strategist
Win Full Conquest mode on Impossible difficulty on any map



These ones aren't that bad as Imperial Conflict, but the last one is still tricky a bit. I can only advice here not to play on very big map size. The higher the difficulty, the more simultaneous attacks you will get. Might be annoying a bit, but sometimes there's no reason to react them all: mostly I just left five workers on island and made my army go further. In this mode I don't use towers at all: better to waste resources on army upgrade or for better units and then just wipe all the enemies from map.

Gold Miner
Amass 10 000 gold


Gold Collector
Accumulate 20 000 gold


Gold Piler
Accumulate 50 000 gold


Gold Hoarder
Accumulate 200 000 gold


The first three or two you will get while Monster Hunt completion, without any special moves. As for remaining ones, while playing on 7x7 map, just leave one island untouched and keep mining resources. Build banks on every of 48 islands (toxic island won't harm the bank), and keep waiting. Check if all you workers are busy mining gold if there any on island :)

No need to set very high difficulty, but such as Normal or even Experienced might be boring sometimes. Find you comfortable one.

As for the bosses, just kick their asses one by one, nothing more, nothing else. No need to wipe all the islands, once you'll kill the boss, the mission will complete. They won't have some special stuff at all, and usually behave as just bigger versions of other mobs associated with them. You'll recognize boss by skull icon above his head.

Maugor the Monster
Defeated Maugor the Monster


Sudogar the Sorcerer
Defeated Sudogar the Sorcerer


Arg the Anger Lord
Defeated Arg the Anger Lord


Reeker the Red Dragon
Defeated Reeker the Red Dragon


Ron the Rebel King
Defeated Ron the Rebel King


Geld-Zom the Ghastly
Defeated Geld-Zom the Ghastly


Morgana the Mother of Monsters
Defeated Morgana the Mother of Monsters


Gruff the Goblin General
Defeated Gruff the Goblin General


Voltaire the Vicious Vampire
Defeated Voltaire the Vicious Vampire


Hur the Hungry Dragon
Defeated Hur the Hungry Dragon


Neu-Morg the Master Necromancer
Defeated Neu-Morg the Master Necromancer


Mahu the Mad Dragon
Defeated Mahu the Mad Dragon

The game will count all the battles you won or lost into some global stats, these achievements are made for such progress.

Humble Beginnings
Achieve a total score of 1000


Wealth Collection Specialist
Achieve a total score of 10 000


Wild Wealth
Achieve a total score of 100 000


Greed Management Lord
Achieve a total score of 1 000 000


The first three you'l easily get while Monster Hunt completion or maybe a bit later.

For the last one, start 7x7 map, wipe all the island except one. Manage some resources, buy more armies, towers, check if all the workers busy (build pumpkins for islands which ran out of resources). When all done and you feel satisfied, go save the game and wipe last island. Then complete level, load again and win again and... so on. 60-80k of total score will be enough to get this achievement fast.

Chief Hoarder
Amass 10 000 food


Industrialist
Amass 10 000 wood


Can be easily got on any 7x7 map.

World Conqueror
Win on a Large map


The world is not too big for us
Win on an Extra Large map


Easily got while Monster Hunt Completion.

True Healer
Attain the rank of Healer


I don't remember if you'll have this achievement once you buy the healer or once you'll unlock him. Anyway, this will happen really soon, as this is the first popular achievement made by everyone.


Vampiric Tendencies
Have a vampire in your army


Not that hard, you'll be able to buy him once you'll unlock Camp. Camp is unlocked when one on your workers will get higher level, no chance to miss it.


Pumpkin Patience
Harvest a max level pumpkin


Two options: when you'll conquer new island which have pumpkins, just don't spawn workers and wait till it's grow to maxlevel. Or you might spam a lot of them on one of you islands, workers won't have time to collect them all, and one will grow eventually.


Elite Force Strategy
Have 10 or more knights in your army


Self-explanatory, mkay? While playing on 7x7 islands you'll have much more, no way to miss.


Dragon Tamer
Own your first dragon


No way to miss it.


Zombie Slayer
Kill 50 zombies in a single game


You'll get it almost on any 7x7 map.


Chief Economist
Own 9 banks


If you fast enough, you can get it even on 3x3 map ;)


Worker Army
Have 100 workers


Spam a lot of them before winning the game or play bigger maps.


Military Career
Level a swordsman to max level


The cheapest guys in blue costumes, but they are quiet effective on very first encounters. Gather bigger army of them and rush couple of easy islands, not that difficult.


Great Wall Builder
Built 16 or more walls in a single game


Spam them before completing any 7x7 game.


Wizard War Council
Have 3 or more wizards in your army


...


Healer Community
Have 10 or more healers in your army


Well...


Rainbow Guard
Construct 4 types of towers in one circle


Okay...


Maximum Size Haunted Pumpkin
Get a maximum size haunted pumpkin. Can only be unlocked during the spoooookiest time of the year.


No need to wait for October, the developers released patch recently. Once you'll find an island populated with funny pumpkin guys, there will be couple of scary pumpkins. Conquer the island, but don't harvest the pumpkins while they are not max-leveled.


Necromancer Pact
Have 3 or more necromancers in your army


Self-explanatory.


Goblin Hero
Have a max level goblin in your army


Same tactic as for Military Career.


Special Forces Strategy
Have 10 or more level 2 horse archers in your army


Easy.


Standardised Warfare
Have 100 or more swordsmen in your army


Spam em before winning the match.


Vampire Lord
Have a level 4 vampire in your army


Vampire King
Have a level 5 vampire in your army


Legendary Vampire
Have a level 6 vampire in your army


Pick any Leader you're comfortable with and who have ability to spawn Vampires, no matter with Camps only or not. Start 7x7 map, get some beginner mixed army, then keep to buying only Vampires. Got this achievement while crushing islands with 30-40 Vampires in total, one of them eventually will get the highest level.


Sharpshooter Army
Have 10 or more max level archers in your army

Self-explanatory.


Undead Army
Have 100 or more zombies in your army


There are few Leaders who can spawn them for food, such as Xee and Xess. You might spam em before the game ends, or whatever. Don't know if using Necromancer counts.



Be a better brick
Research "Masonry" upgrade from the upgrades menu


Meh.


Darkness Confronter
Kill 10 necro towers in a single game


Once you'll get it on some bigger maps.


Rage against the machine
Kill 2 enemy catapults


Killing in the name of..! There are rare islands with 2 or more catapults, cannot be missed during whole game, I think.


Innovator
Acquire all unit upgrades


You'll need to buy each upgrade from the second page like for 4 or 5 times, I didn't count ;)


Ghost Army
Have 20 ghosts or frost ghosts in your army


They looks like, you know what.


Goblin Army
Have 100 or more goblins in your army


Spawn em with special Leader or Camp buiding.

Ice cold killers
Spawn 5 Ice Hunters


Pretend yourself as The Night King.


Siege master
Spawn 10 catapults

...


Death Rights Protector
Kill 10 necromancers in a single game


Start the Monster Hunt game against Ne-Morg the Master Necromancer. If you'll see any tower with pink roof, don't destroy it, only kill some necromancers and runaway. Repeat N times, profit.



Mushroom Magic
Detonate 10 explosive mushrooms


Build em, shoot em, that's all. Not sure, maybe you'll need enemies nearby.

Investment banker
Spawn 3 level 3 banks


On some big map, build three banks in the beggining. Banks will get level as they will produce enough gold. You can see the progress by holding left mouse button on the bank or just clicking on it.


The Flying Axe Strategy
Have 100 or more axe throwers in your army


Pew pew


Dragon slayer
Kill 3 enemy dragons in one game (any level)


Ultimate dragon slayer
Kill 10 enemy dragons (any level)


You'll get em closer to the end of Monster Hunt missions.


Greenskin Warmaster
Level up 100 goblins


Same tactic as Vampires-related or Military Career achievements.


Amphibian workforce
Spawn 50 frog workers


Use Wyone the Water Queen as Leader, go on.


Pumpkin Darklord
Spawn 10 pumpkin necromancers
Use Puck the Pumpkin King as Leader, spawn them. I don't remember how to unlock him, maybe just by completing Monster Hunt, hope someone knows better.


Pumpkinmancy
Spawn 10 pumpkin-men. Quiet tricky, but simple. Once you spawned ten pumpkin necromancers, build a pumpkin close to them. That's all! They'll turn a pumpkin into ally, repeat ten times.


Big dragon hunter
Kill a diamond dragon


You'll get by killing pre-last boss from Monster Hunt missions. If not, you can send low-level meat to any evil dragon on the map, make him uprank and than crush him with real army.


Vampire Slayer
kill 50 vampires in a single game


Almost same as Death Rights Protector achievement. But this time, try to find towers with skulls and stuff, which means they are more-leveled. They will spawn Vampires sometimes. Don't destory towers, only kill Vampires, run away, repeat. Might be tough, make sure you have enough army.


School of wizards
Spawn 50 wizards


Start 7x7 map, build many banks from the beginning, you'll need many gold in the end. Spam em before finishing the level.


Merman special forces
Spawn 20 Merman Archers


Use Wyone the Water Queen as Leader, go on.


Remember Legolas
Spawn 30 level 2 Elf Archers


Pick Swifty the Scavenger Lord as Leader, use tactics from Military Career achievement.

Hope my lil' job helped you. Comment if you have any tips/tricks or wanna point any mistake.

Rate, favourite, or whatever.

Enjoy this beautiful game!