There are seven th secret achievements involved in this.
Crickey.
Heigh Hooo.
Bootable offence.
Daredevil.
Barrel of laughs.
Spinal tap.
Nothin' but net

This is approved by this guy.



IT IS VERY RECOMMENDED TO DO IT ON EMPTY SERVERS!

So this is where we start off, Crikey is an achievement that can be done only in the map Rung Sac and only as Australian soldier.

How the map looks like:
After entering an official empty server (recommanded) Go to ''H,6'' On the map.
Then you should be able to spot a right on the river next to a branch.






Simply just shoot it in any gun and consider it done.

This is also related to Australian only forces achievement, Just a different map.
This map is called ''Long Tan'', should look like this.






Go to ''F,8'' on the map, just spawn as Australian should be at the first defense line, next to A. (You should be able to see a wooden hut next to the river.


The area should look like this:


Then simple go to the coast line and look 40 degree on your compass, then just aim your rifle and look for a dirty old boot.


Simply just shoot it and get the achievement done.

Nothin' but Net is our next achievement which could be done both factions, US one is prefered simply because the basket ball court is way more close to the US side rather than the VC.

This achievement is basic and easy one to do, But to find a server with the specific map.

The map is ''FireBase'' (Not FirebaseGeorgia) Should look like this:




Then Go to ''F,5'' Right besides the American spawn. You will see a basketball court. Just jump under the net to recieve the achievement.




Like I said before the achievement is Hard due to the map, You can find it on small scale, Skirmish. But it's quite diffecult to get this map, eventually you will play on it.

This secret achievement isn't diffecult at all, Just this time it's about the ARVN dlc which you gotta play as them. Basically you gotta go to the basement underneathe the building of C on supremacy and shoot a black barrel.


To do the achievement you have to play on Quang Tri, Map should look like this:

Go to ''E,4'' underneathe the C building. You will see an basement entrance like this.

Go underground and find a black - shadow looking barrel and just shoot it...

Daredevil is also an easy achievement to do, All it require is a little of piloting but people who suck like me shouldn't be worried! If I managed to do it so are you! To begin you gotta join the ''Anal Valley'' map, which looks exactly like that:


Then simply fly under a bridge to get it done!

This is so far my favorite achievement to do, I've done that multiple times it's a bit trickey but logical to do few times, This require you to pickaxe 7 enemies in 1 life without dying.

Tips on how to do it!

In my opinion ''Chu Chi'' defend is the best choice to do that.
Play on official servers, Usually the experienced players play over Clan servers so Official = more FNG's.
Hide and blend with your environment, Such as tunnels, Camouflage and stuff like that.
Use Recon! Recon could be helpful to track down enemies and see where they gather up so you can pickaxe them!

This is a video how it's done:

This is the last secret achievement there are acording to 2020/2021. This one is a bit tricky
but it could be done pretty easily, All you gotta do is play as ARVN and get 11 spine kills.
Spine kills look like this:

Tips on how to complete that:
First, Use marksman rifle, so you can be more precise with your shots.
Aim a little down from the head that's how you will most likely get the spine kill, Don't aim TOO much lower so you won't get heart kill instead!

Video to show how to complete all the following achievements!