Here is the full list of all 18 Endless Savagery achievements.
Eliminate 10 enemies in one game match
Eliminate 100 enemies in one game match
Eliminate enemy using plasm weapon
Eliminate 1000 enemies in one game match
Destroy a tank
Eliminate enemy with flamethrower
Survive at least 10 minutes in one game match
Upgrade move speed to maximum
Upgrade regeneration to maximum
Reach 100 level in one game match
Launch missile to the sky
Collect all weapons types in one game match
Eliminate 50 enemies using Knife in one game match
Eliminate 75 enemies using Pistol in one game match
Eliminate 10 tanks in one game match
Eliminate 300 enemies using Rocket Launcher in one game match
Reach 100 profile level
Open 50 crates with bonuses