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