Here is the full list of all 20 Tiny Troopers 2 achievements.
Kill 100 plague chickens.
Get a full squad in the last zombie map.
Lose 5 troopers to mines.
Use 5 different uniforms in battle.
Your machine gunner has killed 50 enemies.
Upgrade one upgrade category to the maximum.
Kill 50 enemies with airstrikes.
Have at least 500,000 Command Points.
Complete Operation 3.
Destroy 10 tanks.
Use an airstrike to kill 3 enemies.
Complete Operation 2.
Order 10 packages from HQ.
Use each heavy weapon in one mission.
Complete Operation 1.
Unlock the first gated area.
Kill 100 enemies.
Collect 25 Dog Tags.
Fail the first mission.
Complete the tutorial.