Reach the indicated rank to unlock the corresponding skin.

Marine: Gibson: Rank 2
Predator: Claw: Rank 3
Alien: Warrior Dome: Rank 4
Marine: Connor: Rank 5
Predator: Stalker: Rank 7
Alien: Ridged: Rank 10
Marine: Moss: Rank 13
Predator: Hunter: Rank 16
Alien: Praetorian: Rank 19
Marine: Johnson: Rank 22
Predator: Wolf: Rank 25
Marine: Rookie: Rank 28
Predator: Spartan: Rank 31
Alien: Nethead: Rank 34