Here is the full list of all 30 Hexapoda achievements.
Kill your first enemy.
Take a sample of Codonium
Take a sample of Mantis Religiosa
Take a sample of Lithobius Forficatus
Take a sample of Heterometrus Laoticus
Take a sample of Bombus Terrestris
Take a sample of Blattaria
Take a sample of Conculus Lyugadinus
Take a sample of Hirudineas
Take a sample of Tachypleus Tridentatus
Take a sample of Gasteracantha
Take a sample of Colletes Hederae
Complete Bestiary
Unlock the first ending
Unlock the second ending
Unlock the third ending
Unlock all ends
Unlock the first hard ending
Unlock the second hard ending
Unlock the third hard ending
Unlock all hard ends
Obtain a score of 5 000
Obtain a score of 10 000
Obtain a score of 100 000
Obtain a score of 1 000 000
Player the 2nd aircraft or play the game with 2 players
Player the 3rd aircraft or play the game with 3 players
Player the 4th aircraft or play the game with 4 players
Finish the game without using any credits
Complete the map