Did Ogryn Gone bowling in a Heresy( or was it malice?) pug, right before getting on Valk. This one is the easiest. Type or voice ahead of time and most will co-operate.
*It’s not 100 btw, it’s 70 on Malice or higher now, the Steam achievement is bugged as it says 100.
Did Ogryn Heavyweight Champ solo late one night, before we had private (2 man) instances.
Did Just a Flesh Wound (the hardest one) w/ 3 zealots and a psyker pug, low intensity Relay Station 18 mins, all 3 Zealots got it there. This one is probably the hardest because of the map rotation+mutator system.
Solo instances would help, as well as map selection. I like the idea of the ultimate penances not being too easy, but doable. I’m sure sure could use some tweaks though.