Here is the full list of all 20 Tiny Troopers 2 achievements.
Use each heavy weapon in one mission.
Kill 100 enemies.
Collect 25 Dog Tags.
Lose 5 troopers to mines.
Complete the tutorial.
Upgrade one upgrade category to the maximum.
Kill 50 enemies with airstrikes.
Fail the first mission.
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.