AchievementPeek

Going for every achievement? The achievement screen tells you that you are missing something, but not what: every part you haven't done shows as ??? / ???. This mod shows you, with as many spoilers as you want.

• Missing parts show up. Open an achievement's details and the parts you haven't done show their name and your progress in grey: the foods you haven't eaten for The Gourmet, the creatures for The Hunter, the fish for The Fisherman, the ways to die for Are You Alright?, and real numbers for the grinds (12,345 / 65,973 sailed for The Captain). Missing parts are listed first.
• Only what you have come across. By default a missing part only shows when you have run into it: you know the item, recipe or piece, or you killed the creature or picked up something it drops. The rest is counted in one row: Only Odin knows what else is hidden here (14).
• Secret achievements. The Concealed achievements show their name and description, tinted purple, and can be opened. Each boss achievement appears once you have defeated the boss before it, so the next boss is never spoiled.
• Combined achievements (Kings and Queens of Valheim, Child of Odin) list the achievements they need.
• Client-side only; works on vanilla servers.

Achievements in a modded game

Valheim turns achievements off when a mod marks the game as modded (Jotunn and several other mods do). If you want to earn achievements in a modded game, install ModdedAchievements to turn them back on. AchievementPeek itself doesn't mark the game as modded.

Config (com.koendertjh.achievementpeek.cfg)

A boss counts as defeated when your character has killed it in any world, or when it has been defeated in the world you are playing (so a friend's kill counts too).