Successfully complete the indicated task to unlock the corresponding Avatar Award:
Use an adrenaline shot, then use your medikit to heal. This takes a much less time, especially when you are dealing with a horde.
Find a corner, and have a melee weapon equipped. Hold RB while aiming at the approaching zombies. Note: You may get hit a few times.
In the bar in the abandoned town, find the jukebox, and play it to hear "Eat Your Brains" by Jonathan Coulton.
In Dark Carnival: Level 4, find the strength-testing mini-game in the first area. Inject adrenaline, and hit it with a melee weapon to get the "Gong Show" achievement.
In Dark Carnival: Level 2, find the shooting range. Score over 500 points to make a garden gnome appear. Carry the gnome to the end of the level and board the chopper to get the "Guardin' Gnome" achievement.
In Dark Carnival: Level 4, find the Whack-A-Mole type arcade game. Attack it with a melee weapon and destroy it to get the "Stache Whacker" achievement.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points: