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