Here is the full list of all 17 Gachi Bird achievements.
Press Spacebar in Menu
Get 10k in BCoin
Woop x100
Score 50 in Endless mode
Score 15 in Demon mode
Score 10 in Endless mode
Score 25 in Demon mode
hehe
he's sad
Launch Demon mode
Launch Heaven mode
Get 100k in BCoin
???
Brothers
We really do miss you...
Heh
Complite Heaven Mode