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