Here is the full list of all 60 Torchlight III (Alpha) achievements.
Defeat 500 Automatons.
Complete Act 1 story quests.
Complete Act 2 story quests.
Complete Act 3 story quests.
Defeat Brall.
Defeat 10,000 Goblins.
Defeat 500 Hyvid.
Defeat 500 Netherim.
Defeat Psora.
Defeat Sadista.
Defeat Shriekbeak.
Defeat Brall and Sadista.
Defeat 500 Skeletons.
Defeat Squawkclaw.
Defeat Strongtusk.
Defeat 500 Voltura.
Defeat Wideload.
Defeat Yapper in the Occupied Trevail Point.
Defeat 500 Zombies.
Defeat Krronk.
Reach level 100 with any class.
Reach level 100 with the Dusk Mage.
Reach level 100 with the Forged.
Reach level 100 with the Railmaster.
Reach level 100 with the Sharpshooter.
Reach level 50 with any Relic.
Spend 12 points in any skill.
Reach level 100 with 4 different classes.
Destroy 10,000 breakable objects.
Grow an Ancient Luck Tree in your fort.
Craft 25 recipes.
Equip armor of each type.
Equip a weapon of each type.
Find a waypoint.
Find 25 lore objects.
Equip a pet collar and tag on your pet.
Equip an item with 1337 defense.
Use 500 health potions.
Use 100 shrines of any kind.
Equip a legendary item.
Collect 25 legendary items.
Collect 1,000,000 gold.
Defeat 1,000,000 monsters.
Place a reliquary in your Fort.
Visit Trevail Point.
Visit McTyres Cove.
Visit Echo Landing.
Collect 500 Stone.
Collect 500 Wood.
Collect 500 Metal.
Collect 6 different Relics.
Defeat Ordrak in the Clockwork Core.
Collect 6 legendary sets.
Collect the legendary Celestial set.
Collect the legendary Cosmic set.
Collect the legendary Woodsbeast set.
Collect the legendary Skittering set.
Collect the legendary Musketeer set.
Collect the legendary Arc-Powered set.
Collect the legendary Mountain King set.