Skulltaker Halo 3: Grunt Birthday Party

Skulltaker Halo 3: Grunt Birthday Party is an achievement in Halo: The Master Chief Collection. It is awarded for collecting the Grunt Birthday Party skull in Halo 3 on Crow's Nest. The achievement is worth 5 Gamerscore.

Location

 * 1) Method A: On your way to the barracks, you will come across a section in the level where you are required to drop down into a shaft, and at the bottom, are several pipe entrances, where Drones fly in and out of. Reaching the bottom will initiate a Cortana Moment.
 * 2) If you walk to the end of the corridor, there is another large drop (purple pipe with a rotating fan), but do not jump down. Instead, look down around the drop and you will notice a small ledge protruding out a little bit with a green arrow just visible in the middle of it. If you approach the edge very slowly and walk backwards very quickly as soon as you fall, you will land on the ledge. The skull will be located at the end of the passage.
 * 3) Method B: After the battle with the Chieftain and Brutes, grab a grav lift. Continue on until you are in the shaft with the drones. Walk down the corridor and go down the large drop. Turn around and throw the grav lift. Go through it and then you'll enter the passage with the skull at the end of it.