Time to Retire is one of the achievements available in Monaco. It is earned by obtaining the first four mission trophies in the first two co-op campaign Acts. As of February 2016, only 0.43% of players on Steam have earned 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