The idea is :
Add a new game mode. Some of medals and badges add permanent effect for every new game you start.
It not count as a challenge or "standart" game for another unopened medals or badges but a different game mode just for fun and relaxing. But assemblies opened here adds to list, monster kills, rare and unique items found counts at player stats and you can achieve any of medals that you already have.
So, the achievements not only "words", but give us some new abilities, and we can hunt for those Platinum and Diamond badges not only for "Hey, I'm cool!" but for himself and that relax mode.
Fallout Platinum Cross give you a free nuke in inventory on each start. ..."You are so mad that steal one when go Phobos"
(Grammaton Cleric Cross) AND (Armorer Gold Badge) grants you combat pistol at start instead of ordinary.
Gambler's Shield grants ability know lever danger state (as first Intuition trait)
(UAC Diamond Badge) AND (Compet-n Platinum Cross) give you additional +10% speed for all actions (like Scout bonus, but Scouts get actually 20%!)
(Longinus Diamond Badge) OR (Strongman Diamond Badge) give you +3 melee damage (as Brute trait) for free - you are trained in martial arts, man!
Technician Diamond Badge give you any of mod-packs (1 of each type including nano-onyx-sniper..) at start.
Iron Skull grants +1 armor for free - your skin hardens!
(Demonic Diamond Badge) OR (Destroyer Diamond Badge) give you additional intrinsic +10% dodge chance
Hunter Diamond Badge give +1 sight range - wandering in darkness train your vision
and so on. If you have all medals/badges... you become unstoppable :)
It must be separate game mode, not combined with Angels. You can start new game - and play with classic rules. Or can start this mode - and just relax if you have a lot of achievements... Or train your baby :D
The fact is I can try create custom mod for it... but custom game achievements not count at stats, and still no stimulus for getting badges (other then for sign "26/26/26/26" ;))