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