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