The Legend of Heroes: Trails of Cold Steel
51 Achievements
80-100h
Eightfold Obliteration
Defeated 8 enemies at once.
37.4%
How to unlock the Eightfold Obliteration achievement in The Legend of Heroes: Trails of Cold Steel - Definitive Guide
You just need to gather 8 monsters together and defeat them all at once. This is easiest to do with the monster-filled treasure chests, which can spawn 8 monsters as early as Chapter 2. However, they aren't always close enough together at the start of the fight, so you may have to stall a few turns to lure the monsters together, or use skills that reposition enemies if you have any.
Just get 8 monsters into the circle for your S. Craft attack and hope it doesn't miss any of them.
You need to kill eight enemies with only one action (such as S-break or Craft Skill). A good place to try for this trophy is the "trap" treasure chest in Old Schoolhouse Floor 2 (Chapter 2). When you open the chest in this area, you will be attacked by eight enemies. You should move around until they are close to each other, then choose a character who has an S-break skill with a circle-range attack (such as Rean). Please make sure you save the game before attempting this, so you can reload and try again if you fail.
There are a few "trap" treasure chests having 8 enemies in later chapters, so you still have a chance to unlock this trophy. Please see the Overall Walkthrough, it shows you which "trap" treasure chest has 8 enemies, and also lets you know which type of enemies tend to fight in a group of 8.