Your death won't be in vain! Achievement
Your death won't be in vain!15
Collect enough canopic jars to unlock an onyx weapon
Canopic jars appear in the game world at locations at which someone on your friends list who also owns the game has died. The canopics look like grey jars with a slightly bright shimmer. Pick up five of these and the achievement will unlock. This also works in local co-op.