The Surge
67 Achievements
40-50h
Was That Yours?
Defeated a boss with its own weapon Details for this achievement will be revealed once unlocked
3.4%
How to unlock the Was That Yours? achievement in The Surge - Definitive Guide
Use what ever weapon you favour to wear it down then swap to the P.A.X for the killing blow , though I'd recommend swapping sooner like for the last 1/4 of health in case you get carried away
The first chance to do this on your second playthrough will be against P.A.X, but you can obviously do this on any boss that you like. If you don't really like using the weapon, you can complete most of the fight with whichever weapon you'd prefer, and then switch to the corresponding boss' weapon to make the final blow.
Missable / Glitch Warning:
This trophy can glitch on you. After you've defeated a boss with its own weapon, there is a chance you may not obtain this trophy. You have 2 options for this. The first is you can create a backup save before you fight a boss and reload that save back to your game and try it again with that boss, or you can continue on with the game and just kill the next boss with its own weapon.
To get this trophy, you will need to kill a boss with their own weapon. You will only be able to do this on your second playthrough onwards. To get this trophy, you don't need to use the boss' weapon the whole time you’re fighting them. You just need to get the finishing blow on the boss with their weapon to get this trophy.
This is not attainable until NG+. You need to kill a boss with the weapon he dropped on your first playthrough. The earliest you can get it is against P.A.X. at the end of Abandoned Productions.
They gave me the trophy.