Here is the full list of all 19 Maze Mart achievements.
You bought milk. It was a normal night.
You gave your milk to the demon.
You've been arrested.
You picked up bread. Why ?
You got 5 gold coins.
You found the blue candy bag.
You ended the Underworld maze.
You tamed a crow.
You felt to death.
You have been in the mystery area.
He warned you...
You managed to escape!
Isaac has not been seen since.
You was the first to open the first boss room door !
Got the key inside the lava kraken... That was dirty ! You found the key first !
Through tentacles, lava and rotating plateforms... You finally reached the door and opened it !
This slope was full of trap ! And you are the first to pass it ! GG.
You got the trophy of the Maze Mart Challenge. This is a proof of your hard work, you can be proud of it !
We commemorate the day when the dev lost a trophy at the spawn.