Here is the full list of all 19 Ben and Ed achievements.
Beat all level unharmed.
Collect 100% of all candymeat.
Kill 100 chicken.
Beat Hans.
Finish the game.
Reunite with your friend.
Kill 50 chicken.
Impress 200 viewers.
Beat Hans' second masterpiece.
Beat 12 level unharmed.
Kill 20 chicken.
Collect 50% of all candymeat.
Beat 5 level unharmed.
Collect 20% of all candymeat.
Beat Hans' first masterpiece.
Reach a checkpoint in one piece.
Finish the tutorial.
Impress 700 viewers.
Impress 1100 viewers.