Here is the full list of all 15 Gachi Dash achievements.
Die 1000 times summary
Unlock Doomer
Beat all game
Die 100 times on the level
Beat the "Banya" level
Beat the "Gym" level
Beat the "Hospital" level
Beat the "Jail" level
Beat the "Shop" level
Beat the second level
Beat the first level
Get 69 points in Endless Mode
Be defeated by hitting a bottle for the first time.
Unlock fun
Unlock Real Man