Full list of all 70 LEGO MARVEL's Avengers achievements. It takes around 35-40 hours to unlock all of the achievements in the base game on Windows.
The base game contains 40 achievements, and there are 6 DLC packs containing 30 achievements.
Complete the 'All-New All-Different Doctor Strange' level
Complete the 'All-New All-Different Doctor Strange' level with all Minikits unlocked
Complete the 'All-New All-Different Doctor Strange' level after achieving True Avenger status
Set both Free Play characters as Baron Mordo and Dormammu
Find a way to freeze Doctor Voodoo during Free Play in any area of the game
Complete the 'The Masters of Evil' level
Complete the 'The Masters of Evil' level with all Minikits unlocked
Complete the 'The Masters of Evil' level after achieving True Avenger status
Set both Free Play characters as the Enchantress and Executioner in the Asgard hub area
Defeat 20 enemies as the Black Knight (Dane Whitman) during Free Play
Complete the 'Classic Captain Marvel' level
Complete the 'Classic Captain Marvel' level with all Minikits unlocked
Complete the 'Classic Captain Marvel' level after achieving True Avenger status
Set both Free Play characters as Tic and Hawkeye (Classic)
Fly the Captain Marvel Skycycle as Captain Marvel in the Manhattan hub
Complete the 'MARVEL's Agents of S.H.I.E.L.D.' level
Complete the 'MARVEL's Agents of S.H.I.E.L.D.' level with all Minikits unlocked
Complete the 'MARVEL's Agents of S.H.I.E.L.D.' level after achieving True Avenger status
Set both Free Play characters as Agent Leo Fitz and Agent Jemma Simmons
Fly ''The Bus'' vehicle as Agent Melinda May
Complete the 'Classic Black Panther' level
Complete the 'Classic Black Panther' level with all Minikits unlocked
Complete the 'Classic Black Panther' level after achieving True Avenger status
Complete any race in the HUB using the Black Panther Skycycle
Defeat 20 enemies as Killmonger in the 'Classic Black Panther' level during Free Play
Complete the 'Ant-Man' level
Complete the 'Ant-Man' level with all Minikits unlocked
Complete the 'Ant-Man' level after achieving True Avenger status
Set both Free Play characters as Ant-Man (Hank Pym) and The Wasp (Janet van Dyne)
Ride Ant-Thony as Ant-Man (Scott Lang)