Full list of all 15 Hellbreachers achievements worth 1,000 gamerscore. It takes around 0-0.5 hours to unlock all of the achievements on Xbox One.
Beat the boss Ancient
Hold 5,000 coins in your inventory
Defeat 30 enemies
Beat the boss Xenofungus
Beat the sixth level
Open 12 treasures
Hold 2,500 coins in your inventory
Defeat 15 enemies
Beat the third level
Open 6 treasures
Open 3 treasures
Defeat 5 enemies
Beat the first level
Hold 500 coins in your inventory
Beat the boss Goon