Here is the full list of all 100 Freebot : Battle for FreeWeb achievements.
Finish the Intermediate Level B
Kill some bears
Kill a bear
Finish the Intermediate Level A
Finish the Level 1
Find the Automatic Rifle
Finish the Level 2
Finish the Level 3
Finish the Level 4
Finish the Level 5
Finish the Level 6
Finish the Level 7
Finish the Level 8
Find the ShotGun
Find the Rocket Launcher
Find the Grenade Launcher
Find the Sniper
Kill the Statue in Level 1
Kill the Statue in Level 2
Kill the Statue in Level 3
Kill the Statue in Level 4
Kill the Statue in Level 5
Kill the Statue in Level 6
Kill the Statue in Level 7
Kill the Statue in Level 8
Kill the Statue in Level 9
Finish the Level 9
Kill the Statue in Level 10
Finish the Kill Them All Level