Here is the full list of all 37 Aritana and the Harpy's Feather achievements.
Jump a great distance using the Agility Boost.
Dodge a Red Spirit and make him fall into the abyss.
Get fifteen Muiraquitãs.
Win the Forest battle against Mapinguari.
Collect 2 Medicial Plants to increase your health.
Avoid getting stunned after a high fall using the Agility Stance.
Find 3 combos throughout the game.
Fall 3 times into the water during the same level.
Lose one health point trying to attack a Red Spirit.
Bring down a tree.
Get hit by a Spirit right after it's respawn.
Use the Search Ability to find a secret area.
Offer five Muiraquitãs at the end of any level.
Get 100 guaranás.
Make a combo.
Get one Muiraquitã.
Lose one life in any level.
Try to knock out a Spirit jumping over its head.
Reach 99 lives.
Survive the first encounter without losing health.
Survive the second encounter without letting any rock hit the ground.
Survive the third encounter without using the Defense Ability.
Win the Cave battle against Mapinguari.
Win the Mountain battle against Mapinguari.
Make a combo using the Strenght Boost.
Stay in the air for one minute without hitting the ground.
Make 3 different combos without hitting the ground.
Lose 3 lifes against Mapinguari in any encounter.
Make 100% of the game and see the extended ending.
Get thirty Muiraquitãs.
Get all Muiraquitãs.
Get all the Forest Muiraquitãs.
Get all the Cave Muiraquitãs.
Get all the Mountain Muiraquitãs.
Complete all the bonus stages.
Find all combos.
Reach maximum health.