Here is the full list of all 20 Commander Cool 2 achievements.
Kill 1000 enemies
Collect 100.000 coins
Play story with 2 players
Collect all stone age diamonds
Complete all stone age levels
Complete all stone age missions
Kill the final stone age boss
Collect 10.000 Coins
Kill the boss in level 25
Die 1000 times
Kill 100 enemies
Die 100 times
Escape the T-Rex in level 20
Collect 1000 coins
Beat level 15
Die 10 times
Survive level 10
Kill 10 enemies
Kill the boss in level 5
Start the first stone age Level