Here is the full list of all 27 Tunche achievements.
Successfully complete one Challenge.
Rescue a Harvester.
Defeat 4 or more enemies with a single Super Attack.
Talk with everybody at camp at least once.
Defeat Boutu.
Defeat Mapinguari.
Read a Story Chapter of any character.
Obtain a Spiritual Core.
Buy a Skill.
Enter the jungle.
Obtain 50 units of Entropy.
Enter the jungle 50 times.
Defeat 1000 enemies.
Beat every type of enemy once.
Obtain all Spiritual Cores.
Successfully complete 20 Challenges.
Defeat the final Boss.
Defeat the Prisoner.
Defeat Runapuma.
Defeat a Boss without taking any damage.
Beat all Bosses with each character.
Help all Harvesters fully personalize their camp.
Buy all Skills for one character.
Reach a SSS Stylish Grade.
Read all four Story Chapters for every character.
Unlock 30 Compendium entries.
Complete all other achievements.