I unlocked 43 achievements in Mass Effect 2 (JP) and 7 achievements in Mass Effect: Andromeda during March.
Edit: Oh yeah, previous completions: Mass Effect and Mass Effect 2.
Edit: Also got the challenge from Andromeda, if that counts for anything.
Previous completion: https://www.trueachievements.com/game/Mass-Effect/achievements?gamerid=305682
10 achievements + 1 challenge in March: https://www.trueachievements.com/game/Mass-Effect-Andromeda/achievements?gamerid=305682
Mass Effect Infiltrator
12 achievements won this month
4 in ME:A
5 in ME 3
Bringer of War