Here is the full list of all 26 Derpy Dinos achievements.
Hit yourself with a meatsack 10 times
Do no harm for 30 seconds
Catch a volcano rock
Collide two sacks of meat together
Kill 300 dinos
Kill 1,000 villagers
Catch something around the world
Kill 2,000 dinos
Reach the top of the local high score list
Throw and catch the same volcano rock twice
Restore ship health 30 times
Earn a point bonus of 20,000
Shoot 15 dinos in less than 15 seconds
Smash 50 meat sacks with the same volcano rock
Slow time 60 times
Get hit 60 times in one round
Kill 5,000 villagers
Travel around the island 300 times
Collide every item combination
Kill 10,000 dinos
Throw and catch the same stack of 5 villagers together
Score 200,000 10 times
Complete a wave > 5 in < 5 seconds
Kill 20,000 villagers
Earn 30,000 points in the first 30 seconds
Reach wave 11