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.
Your machine gunner has killed 50 enemies.
Complete Operation 3.
Destroy 10 tanks.
Kill 50 enemies with airstrikes.
Complete Operation 2.
Upgrade one upgrade category to the maximum.
Order 10 packages from HQ.
Unlock the first gated area.
Use each heavy weapon in one mission.
Use an airstrike to kill 3 enemies.
Have at least 500,000 Command Points.
Complete Operation 1.
Fail the first mission.
Kill 100 enemies.
Use 5 different uniforms in battle.
Collect 25 Dog Tags.
Complete the tutorial.