Here is the full list of all 14 Cyborg3003 achievements.
Defeat 4 waves of enemies on Eruptia
Kill the Slimy Beast
Beat a level alone or with your friend, without any player being harmed
Beat a level alone or with your friend, without any player dying in the game
Kill the Slimy Beast using the shotgun
Kill the Slimy Beast using the venon strike assault
Beat a map 6 times
Blow up a dragon using a grenade while it is flying in the sky
Beat a level in hardcore difficulty
Beat a level alone or with your friend in hardcore difficulty, without any player being harmed
Kill the Slimy Beast using the sniper blast
Defeat 4 waves of enemies on Ice Planet
Kill the Slimy Beast using the flamethrower
Defeat 4 waves of enemies on Vulcano