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