Here is the full list of all 7 Gachi Dungeon Master achievements.
Successfully carry out a grapple attack.
Pick up a lubricant.
Start the first gachi fight.
I chose the location “Lockerrom” to start the game in any mode.
Choose a popular character from a dance meme as a fighter.
Perform a large number of successful grapple attack in a single match.
Get 15 KOs in Boss of the Gym in single math.