Here is the full list of all 25 Tiny Troopers achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Collect 10 Medicrates in Zombie level
Revive fallen squad members 10 times in Zombie level
Beat Chapter 1
Beat Chapter 3
Lose 5 Troopers to Mines
Lose the first mission
Kill 50 Enemies with Grenades
Kill 50 Enemies with Delta Force
Kill 50 Enemies with Airstrike
Destroy 10 Tanks
Beat Chapter 2
Kill 50 Enemies with Machine Gunner
Kill 50 Enemies with Rockets
Fully Upgrade Your Squad
Destroy 10 Towers
Order 10 items from HQ
Use Airstrike to Kill 3 Enemies At Once
Collect 25 Dog Tags
Use one of each heavy weapon on a single mission
Kill 100 Enemies
Earn 200,000 Command Points
Get a full squad in Zombie level
Kill 100 Zombie chickens
Open a Gate in Zombie level
Complete the Tutorial