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