Here is the full list of all 49 Forge Quest achievements.
You have unlocked a subclass.
Equip a pet for the first time.
You have defeated the boss of the Earth dungeon.
Defeat 50 enemies using an ability.
Place a rune into a socket.
Use a potion while at 10% health or less.
Defeat 100 enemies using a ranged weapon.
Host a game and have other players join you.
Somehow you have managed to best your rival in battle, granting you passage into the Earth dungeon.
You have now left the safe confines of the city and are likely to be eaten by a grue.
You have survived the bureaucracy and lived so that you can fight monsters.
You have defeated the boss of the Ice dungeon.
You have defeated the boss of the Primal dungeon.
You have defeated the boss of the Fire dungeon.
You have completed the game on Normal difficulty.
You have completed the game on Intermediate difficulty.
You have completed the game on Hard difficulty.
You have completed the game on Expert difficulty.
You have completed the game on Master difficulty.
You have completed the game on Normal difficulty in hardcore mode.
You have completed the game on Intermediate difficulty in hardcore mode.
You have completed the game on Hard difficulty in hardcore mode.
You have completed the game on Expert difficulty in hardcore mode.
You have completed the game on Master difficulty in hardcore mode.
You have joined a friend's game.
Be in a game with three other players.
You've tossed the wildlife 100 times.
You have spoken with the hobo 10 times.
Open 50 locked doors using a lockpick.
Solve 25 puzzles.
Succesfully block 100 attacks using a shield.
Take an item to its maximum potential via combining.
Gather 500 resource gems.
Gather 5000 resource gems.
Defeat 100 ninja chickens in battle.
Receive a healing potion from an owl.
Defeat an enemy at least five levels higher than you.
You have been defeated by a boss mob.
You have been defeated by a trap.
Have a hardcore character over level 10 die.
You managed to defeat a boss while at or below 1% health.
Bring a friend back from the brink of death by reviving them.
Heal a friend who is at or below 10% health.
Defeat a boss without using a weapon.
Defeat a boss without using any skills.
Add or upgrade 100 item sockets.
Master everything there is to know about being a warrior.
Master everything there is to know about being a mage.
Master everything there is to know about being a rogue.