Here is the full list of all 34 G.I. Joe: Operation Blackout achievements worth 1,000 gamerscore.
Perform all character ultimates.
Complete Mission 1: "Capture the FLAGG" in under 10 minutes.
Complete all missions of story mode on "Action Figures" dificulty.
During Mission 16: "Enemy of my Enemy" on single player, win the B.A.T. destruction contest.
Complete Mission 14: "Undo What They Did to USS" having defeated most enemies.
During Mission 13: "Unplugged" defeat both Lady Jaye and Scarlett while playing as Baroness.
During Mission 11: "Nothing Personal", defeat Cobra Commander in less than 2 minutes.
Win a multiplayer match with every character from Cobra and G.I. Joe.
Win a multiplayer match in all game modes.
Perform an quick reload with all primary weapons.
On Mission 10: "Fury & Silence", deal the final blow to Storm Shadow using Snake Eyes' katana.
Get half of the game collectables.
Deal damage to 5 enemies with a single grenade.
Complete Mission 8: "It's a Trap!" without losing everything.
Complete Mission 4: "Cold Case", without receiving health damage from Zartan.
Complete the tutorial.
Complete all secondary objectives on story mode.
Get all the collectables.
Complete Mission 2: "Light's Out" without activating any turrets.
Complete Mission 5: "Scarcity of Freedom" using the self-destruct sequence only once.
During Mission 6: "Come With Me If You Want To Live", knockdown Destro at least 4 times.
Complete Mission 8: "It's a Trap!" with 2 minutes or more left.
Complete Mission 8: "It's a Trap!" destroying no more than 3 B.A.T.S. pods.
During Mission 9: "Made in Japan" as Storm Shadow, defeat most of the ninjas using melee attacks.
During Mission 9: "Made In Japan" as Firefly, defeat most of the enemies using only the Boomslang.
During Mission 10: "Fury & Silence", don't lose your grasp on the mold.
During Mission 12: "First Light" defeat 25 B.A.T.'s using turrets.
Complete Mission 13: "Unplugged" as Destro without taking down neither Scarlett nor Lady Jaye.
Complete Mission 16: "Enemy of my Enemy" in under 15 minutes.
Complete Mission 17: "Freedom Squad" without losing control of your character.
During Mission 17: "Freedom Squad", defeat the last boss avoiding its special attack.
Complete all missions of story mode on "Government Issue" difficulty.
Complete all missions of story mode on "Man of Action" difficulty.
Complete all missions of story mode on "Real American Hero" difficulty.