SD GUNDAM BATTLE ALLIANCE

This is for doing over 3,000 points of damage in either one move or a single combo. I wish I knew this because it confused me with the achievements wording making me think it was accumulated damage over play or maybe on one enemy. So I figured I’d share what I found through trial and error trying to get it myself. If you find yourself dropping your combo before getting the 3000 I suggest using the pilot skill Combo Meister to extend your combo continuation time. As soon as you get over 3000 points of damage the achievement should pop for you.

This one unlocked for me along with the "Deal 2,000 damage" Achievement during the Chaos version of The Shuddering Mountain Part 2.

Piloting a level 30 Gundam Ground Type, I encountered the extra boss for the stage, a Gundam I didn't recognize, by moving all the way to the right on the map to the ruined city area, then the enemy Gundam and an ally Gundam appeared. I used the Special Attack of the Gundam Ground Type and apparently hitting all three shots from the 180mm Cannon was enough to deal the damage needed for this Achievement. I didn't have anything special equipped for parts, just an Auto-Guard and a small Ranged booster that gave 25 points to ranged and 7% to main attack.