1. Fulfill quests - each fulfilled quest (including closing flags) will grant you 5 additional tiles. *
1a. Dont forget Flags! They are also quests! You need to close the flagged area for 5 additional tiles.
2. Do perfect tile placements - this will grant you 1 tile.

This means if you want to stay in the game you either close a quest every 5 turns or do only perfect placements.
Both is impossible to achieve with the random tile generation in conjunction with the railroad/river tiles, which can hardly be used in your regular quest closing.

* To be perfectly exact: you get 5 tiles, but the one you placed is used and therefore the counter only raises by 4 as the tile you used is substracted before getting the 5 tiles. (credits to chaney for pointing this out)

1. Close a quest - 100 points
2. Close a flag - 50 points
3. Place tiles fitting to each other - 10 points per fitting side.
4. Score a perfect tile placement (all 6 sides fit) - 60 points extra -
Exception: Lakes and Stations fit everywhere, but are only counted as perfect if you have water/rails on all sides.
Still confused? Look here:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2439889141
Attention: If you place a perfect fit, which is already surrounded by six placed tiles - you score only once 60 points - if you add a tile and therefore close a perfect fit - you score twice: 60 points for the perfect fit (in addition to the previous scored points for this tile).

1. Number+ quests are easy to accomplish as long as you expand your area.
2. Number quests require the exact number of items in an area.
3. Number*Triangle quests require you to close the area after you reached the number. This grants you actually 8 tiles - as consecutive solving is required.
4. Flag quests ask you to close that area. This means you need to prevent further extension of this area by placing tiles which close the area. Tiles do not have to fit to close an area.
5. Crown Number+ quests - you need to build to the white spots outside of the your current map to start these quests. They are harder to achieve, but will unlock a new reward challenge for future games(beside granting 5 tiles/100 points). The closer you come you will see a shadow preview, which might give you a hint what quest is behind, use this to prepare the quest already on last tiles towards it.

New quests will spawn automatically, when you are low on quests. There are no penalities for missed quests.
Therefore quests you dont want to do, should be closed as soon as possible by placing the tile in a way, that the quests turns red.
So in an ideal situation you close the quest and work on another quest.

The requested quest amount seems to be always above your biggest open area, but related to your overall map size. T his is also true for fixed Number Quests - they seem to be spawned sometime below the size of your biggest area, but also scale with your land size.
Therefore closing an area, might reduce the requested number of trees/buildings/fields, but new quests are still harder to fulfill as in the early game.
Hints: If you point your mouse over the quest marker/flag the game will indicate the not yet closed tiles for your area.

1. You can only fulfill the three Rewards displayed in the top right corner in your current sessions. All other achievements will be ignored.
2. Each reward will grant a new tile.
3. Completing the tutorial grants you a Windmill tile.

1. Build railroads and river tiles away from you mainland. Because they
- severly restrict your placement options
- have only limited placement options
2. quests are simple to accomplish - just extend your one and only network
3. Kill all non railroad/river connected quests on railroad/river tiles immediatly.
They are much harder to solve and are not worth our effort.
4. The Railstation is a Joker tile which connects water and railroads - use it wisely!

1. Do not ignore closing flags - each gives you 4 tiles! Therefore keep all your areas easily closable - optimum 2-3 open sides only.
2. You do not need to fulfill every quest - fail quests you dont like.
3. If your area is already too big for an exact number quest - try the following:
- place this quest tile near your big area, close it and then connect to your big area
4. Keep the number of quests as low as possible - only then new quests spawn.
5. Prioritize "Rewards" and quests with crowns - these will grant you new tiles and more starting tiles.
6. For certain rewards you need to change your regular playing style - do this in a specific session.
7. Be realistic what you can achieve with your remaining tiles! Sometimes its better to close an area for additional tiles than to fulfill the number quest in the same area! Closing is simpler than getting enough houses/trees/fields!

(credits to Lantantan)

Compact land mass: For perfect fits its easier to build your landmass in an compact way. As you find easier good fits for tiles where only 2 or 3 sides are given, than for tiles where 4 or more sides are already defined. So try to avoid long octopus like arms and try to fill the gaps early.
Especially at the beginning try to enable all possible types at your outside border, so that you have enough placing options.

Railway/River usage: There is tendency to build rivers and railroads outside your regular mass to avoid the build restrictions they are imposing on you. A better tactic would be to use rivers and railes shaping your direction and then extend the sites with regular tiles. (Remember the Compact land mass?)

Tile Themes and Shape Which tiles are easiest to place? Depends were you want to place them:
a. Outside border (1 or 2 sides to connect): tiles with showing multiple types have a great variability and tend to offer more possibilities.
b. Concluded space (4 - 6 sides already defined): tiles 5 or 6 sides of the same type are here preferable as you can rotate these tiles completely to your needs. So if you need to leave gaps try to leave gaps for such tiles.

Puzzler Reward: If you need to finish the rewards of type puzzler ignore all above rules. Play your game until you have an reasonable amount of tiles available and a reasonable size. Then just place 1-1 connections and other simple 2-2 connections until you achieved the number of tiles.
(Works for 25 and 50 tiles - for 100 tiles you also have to do some quests in between)

Self-Sufficiency Reward(s) You need to create groups of fields with at least 10 fields. And then close them in a way that you can no longer add fields to the group. If you have a quest open, hovering your mouse of the quest will highlight all open sides in yellow.

"But OP - these are too many rules. I just want to play and have something to brag about."
"So what do you want to brag about?"

• "Highscore!" "Go for:
  
  1. Perfect Placements
     
  2. Quests. (in this priority)"

• "Rewards!" "Go for:
  
  1. Reward Goal
     
  2. [if the Reward Goal requires more than 50 tiles] Quests."

• "Looong Playtime!" "Go for:
  
  1. Perfect Perfect Placements."