Here is the full list of all 33 Mission: It's Complicated achievements.
Complete the game with Nightgaunt and Zael.
Complete the game with Zael and Zirconia.
Get an ending between two heroes.
Complete the game with Zael and Riptide.
Achieve 1 kiss between two heroes.
Complete 10 missions in a row without injury.
Achieve 1 platonic friendship between two heroes.
Complete 1 park date between two heroes.
Get more than 3 A+'s during a single playthrough without using "Skip."
Get one A+ after completing any mission.
Complete 1 coffee date between two heroes.
Complete second tutorial mission.
Get the Possibility Stone.
Complete Zirconia's interview.
Complete all 5 interviews.
Complete 3 missions in a row without injury.
Complete Nightgaunt's interview.
Complete Zael's interview.
Complete Riptide's interview.
Complete Wifi's interview.
Complete first tutorial mission.
Get more than 10 A+'s without using "Skip."
Forget to get the Possibility Stone
Achieve 100% in the Gallery.
Get the Ultimate Ending.
Earned all 10 kisses and platonic friendships between all heroes.
Complete the game with Nightgaunt and Wifi.
Complete the game with Nightgaunt and Zirconia.
Complete the game with Nightgaunt and Riptide
Complete the game with Zael and Wifi.
Complete the game with Wifi and Zirconia
Complete the game with Wifi and Riptide
Complete the game with Zirconia and Riptide