You Laugh, It Works Achievement in Doom 3: BFG Edition
You Laugh, It Works5
Find the bloody handiwork of Betruger (in Delta 4 Hallway) in DOOM 3
How to unlock You Laugh, It Works
Right at the beginning of the Delta Labs 4 level, go through the first bloody hall, take a left, go through the next two doors, and then in the far back right corner you will see a bloody skeleton and beside him these exact words will be written in blood. Shine your flashlight on them and this one will be yours.
Thanks to Minahjjang for pointing this out.