Full list of all 70 LEGO Batman 3: Beyond Gotham achievements. It takes around 30-35 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 Man of Steel level
Complete Man of Steel level with all Minikits unlocked
Complete Man of Steel level after achieving True Hero status
Set both Free Play characters as General Zod and Superman (Man of Steel)
Play as Krypto in the Man of Steel level
Complete Batman 75 level
Complete Batman 75 level with all Minikits unlocked
Complete Batman 75 level after achieving True Hero status
Set both Free Play characters as Batman (Sinestro Corps) and Vampire Batman
Complete Batman's special Anniversary Dance Puzzle as Batman (1966)
Complete the Dark Knight level
Complete the Dark Knight level with all Minikits unlocked
Complete the Dark Knight level after achieving True Hero status
Set both Free Play characters as Bane (Dark Knight Rises) and Scarecrow (Batman Begins)
Defeat Batman (Dark Knight Trilogy) as the Joker (Nurse) character
Complete Arrow level
Complete Arrow level with all Minikits unlocked
Complete Arrow level after achieving True Hero status
Set both Free Play characters as John Diggle and Felicity Smoak
Defeat 20 enemies on the Island by using a bow and arrow weapon
Complete The Squad level
Complete The Squad level with all Minikits unlocked
Complete The Squad level after achieving True Hero status
Set both Free Play characters as Amanda Waller and Harley Quinn (The Squad)
Complete any hub race using Harley Quinn's Motorcycle
Complete Bizarro level
Complete Bizarro level with all Minikits unlocked
Complete Bizarro level after achieving True Hero status
Set both Free Play characters as Darkseid and Desaad
Play as Darkseid on the Moon