Which trophy/achiement u felt most accomplished when u got it?

[KHlover]

That's hard...I'd guess it would be from TF2:

Schnellschuss Teil 2
Töten Sie 5 Feinde mit den kritischen Treffern nach Ihrem First-Blood-Kill.

Quickshot Part 2(?)
Kill 5 enemies with the crits after your First-Blood-Kill.

Only 5.2% of all TF2 players ever got this achievement^^