Dem Bones is one of the achievements available in Monaco: What's Yours Is Mine. It is earned by reviving an online teammate. As of September 2014, only 28.6% of players on Steam had earned the achievement. When a player runs out of health in a multiplayer game, they will display a death animation. Another player can revive the corpse, however. Doing this for the first time will earn the achievement.
Bring the Bleach | Cerveau | Dem Bones | Identified | I Work Alone | Massacre | Play It Again Sam | Silent Withdrawal | Slippery | Technician | Time to Retire | Unscathed | Whacked