This trophy is bugged to hell and back.
I have tried several times, to great effort, to use nothing but the claws against the FT, but I am yet to see this pop.
-Avoided the trees to keep my Plasma caster from auto-equipping.
-Downed FT members three times with claws, then beat them to death with them without claiming.
-Downed FT members and did a quick claim after killing them with claws
-Downed FT members and did a quick claim after killing them with claws
-Allowed FT to reinforce and downed them again
So far nothing seems to pop this trophy. Are we going to have to boost this in order to achieve 100% completion?