Slippery is one of the achievements obtainable in Monaco. It is awarded for completing the first mission, Prison Break, with a score under 1:10. As of September 2014, only 1.5% of Steam users had achieved "Slippery".
Due to the need to quickly unlock doors and to collect multiple coins, it is recommended to attempt this mission with the Locksmith and the Pickpocket.
Bring the Bleach | Cerveau | Dem Bones | Identified | I Work Alone | Massacre | Play It Again Sam | Silent Withdrawal | Slippery | Technician | Time to Retire | Unscathed | Whacked