Here's a some of the working glitches on Call of Duty: Advanced Warfare Reckoning.
Call of Duty: Advanced Warfare Reckoning Glitches
Exo Zombies Mode Glitches
These are found in the Descent map of Exo Zombies Mode.
Zombie God Mode: You can get Godmode on a zombies pile-up spot by walking up to the start of the Galleria area’s circular stairs up, where at the bottom of the stairs zombies will get stuck if you stand there on the stairs within firing range. And it does work on zombie dogs too.
Unlimited Rounds: Get to high Rounds with a pile-up glitch on Xbox 360. It’s above the Triton’s Island spa room’s entrance/exit door by jumping up to the top of the door; Go stand above the arched door so the zombies cannot reach you.
Here’s another invincibility wallbreach glitch:
Multiplayer Map Glitches
Location: In the Overload multiplayer map on the outside of the playfield.
Find out how to execute the Teleport Glitch out of this map:
Credits: Glitches by TheGlitchingTube and icYFTL