Darkest Dungeon II
79 Achievements
GOG
Triage
Treat a disease, remove a negative quirk, and lock-in a positive quirk at a single Field Hospital
3.9%
How to unlock the Triage achievement in Darkest Dungeon II - Definitive Guide
The field hospital is a road location that is relatively uncommon, probably only 1 node per region. They can be difficult to find without some sort of scouting buff or finding a watchtower. When you find one and get to it, you'll need to complete all 3 actions to unlock this cheevo. I would recommend saving up some relics because this will be pricey, you'll need at least 56 relics to do all 3. I do not believe all 3 actions need to be on the same hero.
Diseases are not common on the first and second difficulty levels (Denial and Resentment). As you go up in difficulty, they become more common. You'll almost always have negative quirks and I recommend removing those as your resources allow. Not all positive quirks are worth locking in; in general I would recommend keeping those related to stress avoidance, crit, and raw damage. Location-based quirks are not worth it but you could still lock it in if you're desperate for the cheevo.
Diseases are not common on the first and second difficulty levels (Denial and Resentment). As you go up in difficulty, they become more common. You'll almost always have negative quirks and I recommend removing those as your resources allow. Not all positive quirks are worth locking in; in general I would recommend keeping those related to stress avoidance, crit, and raw damage. Location-based quirks are not worth it but you could still lock it in if you're desperate for the cheevo.