Silent and deadly Achievement
Silent and deadly20
Got a stealth kill with every melee weapon in Sinister’s Lair without being detected
When you are approaching the throne Sinister is sitting on at the end of the "Landed in Prison" stage, there will be a few enemies roaming around. Take each one out with one of the three available melee weapons, switch weapons, repeat. You must have purchased the melee weapons from the upgrade menu to use them.