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