Here is the full list of all 55 Bless Online achievements.
Dismantled legendary level equipment
Killed someone ranked higher than a Commissioned Officer 100 times from the opposing faction (Regardless of area/content)
Succeed in the Jackpot Mini-game 100 times
Acquired 100 hero level items from the Gathering Dungeon (cumulative)
Won 5 times consecutively in the Arena
9 kills in once match
Eliminated the Field Boss once
All of your equipment's durability was at the red level
Reached max equipment enhancement level
Eliminated the Roisa of Greed (Urutus Mine Troops)
Kill 10 general monsters in Basel Gorge
Cleared Kobold Hideout with a party
Visited the Arena once
Completed the 3rd stage of Enemies and Monsters (150 species regardless of type)
Reached professional level in gathering
Reached professional level in crafting
Achieved a set amount of points in the Siege of Castra
Reached +10 equipment enhancement level
Participated in the Siege of Castra once
Faction was 1st place in the Siege of Castra
Eliminated the opposing faction 3 times (Regardless of faction/content)
Reached master level in gathering
Acquired high level crafting material from dismantling
Won a duel against a Ranger class character
Cleared either the Underground Prison of Balmont or Guiscardo's Hideout 2 times
Reached level 45
Used Activity points at the store (Combat Points/Dungeon Points)
Using repair tools recovered 1000 durability points (cumulative)
Reached master level in crafting
Cleared a dungeon(Urutus Mine) with all your equipment's durability level at orange
Reached +3 equipment enhancement level
Completed the 3rd stage of Enemies and Monsters (10 species regardless of type)
Won a duel against a Mage class character
Won a duel against a Paladin class character
Won a duel against an Assassin class character
Dueled 3 times
Won a duel against a Guardian class character
Won a duel against a Berserker class character
Cleared a dungeon with a friend in your party
Joined a guild
Added a friend
Acquire rare level mount/pet through leveling up
Acquired 20 items from the Gathering Dungeon
One piece of your equipment's durability was at the red level
Used the market once
Entered the Gathering dungeon once
Dismantled equipment 10 times
Acquire 10 mounts/pets through taming
First time crafting
Repaired equipment durability using repair tools
Completed the 2nd stage of Enemies and Monsters (1 species regardless of type)
First time acquiring Activity points (Combat Points/Dungeon Point)
First time gathering
Entered a big city
Entered disputed territory