Here is the full list of all 36 Bowerwhelm achievements.
Walk 10,000m
Fire 1,000 Arrows
Fire 5,000 Arrows
Fire 15,000 Arrows
Fire 50,000 Arrows
Deal 500 Damage
Deal 5,000 Damage
Deal 200,000 Damage
Deal 1,000,000 Damage
Die 5 Times
Die 15 Times
Die 30 Times
Die 70 Times
Evolve 5 Times
Evolve 10 Times
Evolve 20 Times
Evolve 40 Times
Earn 2,000 Coins
Earn 5,000 Coins
Earn 15,000 Coins (not from guys)
Earn 30,000 Coins
Jump 200 Times
Jump 750 Times
Jump 2,000 Times
Jump 5,000 Times
Kill 200 Balls
Kill 1,000 Balls
Kill 5,000 Balls
Kill 10,000 Balls
Level Up 100 Times
Level Up 500 Times
Level Up 1,000 Times
Level Up 5,000 Times
Walk 150,000m
Walk 500,000m
Walk 2,000,000m