Full list of all 69 Gnomes achievements.
The base game contains 38 achievements, and there are 2 DLC packs containing 31 achievements.
Survive day 16 as the Demomen.
Survive day 16 as the Monks.
Survive day 16 as the Prisoners.
Survive day 16 as the Foragers.
Survive day 16 as the Phalanx.
Survive day 16 as the Beekeepers.
Survive day 16 as the Gamblers.
Survive day 16 as the Capitalists.
Survive day 16 in the Enchanted.
Survive day 16 in the Sewers.
Survive day 16 in the Steppe.
Survive day 16 in the Underworld.
Survive day 30 by only gaining common items.
Survive day 30 by only gaining uncommon items.
Survive day 30 by only gaining rare items.
Survive day 30 by only gaining relics.
Survive day 30 by only gaining buildable items.
Survive day 16 as the Apes.
Survive day 16 as the Explorers.
Survive day 16 as the Assassins.
Survive day 16 as the Berserkers.
Survive day 16 as the Ghosts.
Survive day 16 as the Shoppers.
Survive day 16 as the Peacekeepers.
Survive day 16 as the Scientists.
Survive day 30 in the Portal.
Survive day 30 in Portal II.
Survive day 16 in the Caves.
Survive day 16 in Niflheim.
Survive day 16 in the City.
Survive day 16 in Portal II.