Here is the full list of all 43 Save the Dodos achievements.
Play a level more than 25 times
Kill 100 dodos
Reach 10 defeats
Complete 20 achievements
Accelerate time more than 25s
Do nothing during more than 60s
Kill 50 dodos
Keep a tile pressed more than 25s
Play a level more than 10 times
Move 15 tiles in less than 5s
Save 100 dodos
Move 10 tiles in less than 5s
Move 5 tiles in less than 5s
Complete 10 achievements
Lose in less than 20s
Play a level more than 5 times
Clear 25 levels
Kill 20 dodos
Clear a level in less than 15s
Save a dodo narrowly
Save 50 dodos
Do nothing during more than 30s
Clear a level in less than 20s
Clear a level in less than 25s
Reach 1500000 points overall
Complete 35 achievements
Win 50 stars
Lose a dodo next to an exit
Save 5 dodos at the same time
Kill 5 dodos at the same time
Get more than 1 special dodos
Lose a dodo in less than 1s
Reach 500000 points overall
Clear 100 levels
Save 200 dodos
Reach 25 defeats
Reach 50 defeats
Clear 60 levels
Win 150 stars
Win 300 stars
Get more than 2 special dodos
Get more than 3 special dodos
Reach 1000000 points overall