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