Terraria achievements

Defeat the Eye of Cthulhu, an ocular menace who only appears at night.

Equip your first grappling hook.

Survive a blood moon, a nocturnal event where the rivers run red and monsters swarm aplenty.

Obtain a boss-summoning item.

Become a victim to a nasty underground trap.

Obtain an anvil made from iron or lead.

Discover and smash your first heart crystal underground.

Craft a mana crystal out of fallen stars, and consume it.

Discover a golden chest underground and take a peek at its contents.

Equip armor in all three armor slots: head, chest, and feet.

Obtain your first hammer via crafting or otherwise.

Build a house suitable enough for your first town NPC, such as the guide, to move into.