The Minerva’s Den Add-on for BioShock 2 has 8 achievements.
Killed a Lancer Big Daddy
Reached Rapture Central Computing Operations
Reached Computer Core Access
Escaped Minerva's Den
Wrested control of the Thinker from Reed Wahl
Destroyed all 10 Vacuum Bots in Minerva's Den
Got 9999 points in one game of Spitfire
Resolved all the Little Sisters in Minerva's Den