Here is the full list of all 12 Bengan Yes achievements.
Have 1000 characters in your game!
Win in your own lobby... Shameful
Have 100 characters in your game!
Have 10 characters in your game!
Played Bengan Yes
Have the hackerman ReeZey join your game
Have the CREATOR Addemannen1 join your lobby
Have the insane 3d artist 123meinkratf join your lobby
Have the REAL LucasNagy join your lobby
Have the MONKE August join your lobby, smile
Have the max amount of players joined to your round (20640)
Finish the Bengan Bros campaign