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Tetrachromancer
Collect all hunting companion colors.
Tetrachromancer requires collecting all hunting companion colors, earned through completing Grand Hunts in the Dragon Isles.
Farm Grand Hunts Weekly
The companion colors, including 
Bakar Companion Color: Black, can drop from the white satchels rewarded by Grand Hunts. The drop rate is significantly higher from your first weekly hunt reward, so prioritize completing at least one Grand Hunt per week on each eligible character.
Use Alts for Extra Rolls
This achievement is account-wide, meaning colors obtained on any level 60 or higher character count toward progress. Each alt's first weekly Grand Hunt reward has the boosted drop rate, so running one hunt per week across multiple characters is the most efficient farming method.
Speed Farm With Class Trials
Create a Class Trial character (auto-boosted to level 60), take the portal to Valdrakken, unlock all Dragonriding talents from the Dragonriding menu, then fly to the nearest Grand Hunt and complete it to receive the purple reward bag. This method takes roughly 10 to 15 minutes per character and requires at least one of your main characters to have max reputation with Maruuk Centaur.
Tips
Because the achievement is account-wide, logging into a different character after earning a color still grants the achievement progress, even if the item was looted on an alt.
Each character's first Grand Hunt reward of the weekly reset has a noticeably higher drop rate than subsequent hunts that same week, making additional hunts on the same character far less efficient.