The 1.4.1 Title update for Terraria has 15 achievements.
You were so preoccupied with whether or not you could open the chest that you didn't stop to think if you should.
Repel the strongest forces the Old One's Army can muster.
Deliver headpats to the town pet.
Trick a gnome into turning into stone!
Encounter a fairy.
Defeat the Empress of Light, responsible for all those flashy lights and glitter.
Defeat Queen Slime, giving the coup-de-grace to the sovereign of all that jiggles.
Defeat the Dreadnautilus, murderous mollusk lurking beneath the surface of the sanguine seas.
Obtain the Zenith, the culmination of a journey forged into the ultimate sword.
Obtain the Terraspark Boots, forged from the finest boots of fire and ice.
Fly a kite on a windy day.
Enter a misty graveyard filled with the surly dead.
Drop a lure in a pool of lava for a pre-fried haul!
Meet with a tenant who's as happy as they possibly can be!
What you're celebrating doesn't matter, just throw a party already!