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