Head into the tutorial until you find yourself in a room with a North, East, and West exit. (Shortly after collecting blanks)
Take the west past until you reach the end and use a Blank to reveal a secret passage. Inside you'll find a Shield and Helmet.
Complete the tutorial
Now Start a run and once you get to the 3rd Chamber you will find a room with an NPC named "Blockner". Talk to him and tell him "Manny says Hi". He will flee, follow him and defeat him to earn the achievement.