The following are known Action Replay Codes for Rayman 2: The Great Escape on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Have All Crates
810c70f87fff
810c70faffff
810c70fcffff
810c70feffff
810c7100ffff
800c710200ff

Lotsa’ Lums Part 1
500064010000
800c710800ff

Lotsa’ Lums Part 2
500019010000
800c70bd00ff

Open Map
810c70f0ffff
810c70f2ffff