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