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