The Episode 30: Earth 3 Add-on for DC Universe Online has 4 achievements.
During Earth 3: The Visitor (Normal) Duo, in Lex's Office, defeat Alexander Luthor once without getting frozen by the Freezing Trap and once again by being frozen at least one time.
During the Earth 3: Injustice System (Normal) Alert, don't let any guests at the Gala get blown up in the Owlman Fight.
During Earth 3: The Panopticon (Normal or Elite) Raid, defeat each of the bosses in the 4 minutes or less.
During Earth 3: The Escape (Normal or Elite) Raid, defeat the Final Bosses all within 12 seconds of each other.