Here is the full list of all 111 OBCIDIAN LEGACY achievements.
Pass the Guardian entrance exam as a Blademaster
Pass the Guardian entrance exam as an Assassin.
Pass the Guardian entrance exam as an Elementalist.
Destroy the Manuk of the Forest
Destroy the Manuk of the Sea
Destroy the Manuk of the Cave
Destroy the Manuk of the Swamp
Destroy the Manuk of the Glacier
Destroy the Manuk of the Savannah
Destroy the Manuk of the Ruins
Kill 1000 Myconids
Kill 1000 Digbo or Digswords
Kill 1000 Harpies
Kill 1000 Valines
Kill 1000 Gilmen
Kill 1000 Turtles
Kill 1000 Maggots or Fire Maggots
Kill 1000 Hoppers
Kill 1000 Armadillos
Kill 1000 Cocoons
Kill 1000 Skeletons
Kill 1000 Fiends
Kill 1000 Evil Eyes
Kill 1000 Wraiths
Kill 1000 Pengis
Kill 1000 Hounds
Kill 1000 Polizzlies
Kill 1000 Peackers
Kill 1000 Nagas
Kill 1000 Rhinoth
Kill 1000 Pawns
Killl 1000 Bishops
Kill 1000 Homunculi
Kill 1000 Mastemas
Kill 1000 Greater Enemies
Kill 100 Golden Mushrooms
Defeat 10000 enemies total
Clear the main quests in the forest
Clear the main quests near the beach
Clear the main quests in the cave
Clear the main quests in the swamp
Clear the main quests on the glacier
Clear the main quests on the savannah
Clear the main quests in the ruins.
Accomplish all additional goals for any main quest.
Begin playing any daily quest
Being playing any arena quest
Clear all arena quests
Clear any side quest
Clear 100 or more side quests
Clear all of Taura's side quests
Clear all of Sol's side quests
Clear all of Fil's side quests
Clear all of Stella's side quests
Clear all of Jiji's side quests
Clear all of Kamal's side quests
Clear all of Ravian's side quests
Clear all of Toona's side quests
Clear all of Isaac's side quests
Clear all of Jasmine's side quests
Clear all of Goodman's side quests
Clear all of Carlo's side quests
Clear all of Hammer's side quests
Clear all of Enny's side quests
Reach level 5
Reach level 10
Reach level 20
Reach level 30
Reach level 40
Reach level 50
Collect 1,000,000 gold in total
Obtain 5 or more skills
Otain max level in any skill
Fill up your inventory with items
Fill up your storage with items
Set a recovery item in a quick slot
Use 100 HP or MP recover items in total
Equip any "Uncommon" item other than a gem.
Equip any "Rare" item other than a gem.
Equip any "Ultra Rare" item other than a gem.
Strengthen any weapon or armor to +10
Slot a gem into any piece of equipment
Slot 8 gems total into a piece of equipment
Equip maxed-out gear in every slot
Equip gear with 8 gems inserted into every slot
Sell 100,000 worth of items at the Item Shop
Power up more than 200 time at the Blacksmith
Disassemble over 1000 items at the Disassembly Shop
Slot 100 or more gems at the Gem Shop
Remove 100 or more gems at the Gem Sop
Use any Active Skill more than 500 times
Use the Dodge Roll 500 times or more
Hit any enemy for 1000 damage or more
Start a wave
Continue a wave until the end (5 waves)
Get "Gold Up" during a wave
Get "Time Plus" during a wave
Get "Enemy Level Up" during a wave
Get "Next Wave" during a wave
Start 100 or more waves
Destroy 500 or more destructible objects
Open 100 chests (S, M, L)
Clear any quest in Multiplayer (any number of players)
Clear 100 quests in Multiplayer (any number of players)
Follower any other player
Follow the maxiumum number of players (20)
Edit your profile comment
Play for 20 hours or more
Play for 50 hours or more
Watch the title screen loop once.
Make use of ancient knowledge