Here is the full list of all 14 You Arrive in a Town achievements.
Slay Gareth the Goblin King.
Complete the Game.
Clear every objective in the game.
Earn 2500 Gold in a single playthrough.
Defeat 1000 total enemies in a single playthrough.
Complete the tutorial level.
Complete the first level with 2 or more players.
Purchase an item from the shop.
Equip an item in every inventory slot.
Slay Seymour the Lava Snapper.
Slay the Great Golem, Greg.
Help to "tidy up".
Complete New Game +.
Buy every item in the shop at least once in a single playthrough.