The The Masters of Evil Pack Add-on for LEGO MARVEL's Avengers has 5 achievements.
Defeat 20 enemies as the Black Knight (Dane Whitman) during Free Play
Complete the 'The Masters of Evil' level with all Minikits unlocked
Set both Free Play characters as the Enchantress and Executioner in the Asgard hub area
Complete the 'The Masters of Evil' level
Complete the 'The Masters of Evil' level after achieving True Avenger status