Hi there. The description of this triumph is a little misleading. You need to get 40 [b]final blow[/b] kills against enemies (Guardians do not count). You'll know you've done it correctly when you see the Thrillmonger medal appear on your screen during a match, which is not to be confused with the Killmonger medal for 20 final blow kills. Don't rely on the count shown on the PGCR screen after matches, as the number of kills shown are final blows + assists combined.