Here is the full list of all 45 Nanuleu achievements.
Defeat the invaders in less than 15 minutes
Defeat the invaders in Counterattack, Sage mode
Destroy the 4 altars
Defeat the enemies in Counterattack, Warrior mode
Defeat the invaders in Invasion, Sage mode
Protect the 4 altars from the invaders
Defeat the enemies in Invasion, Warrior mode
Defeat the invaders in Warrior Mode
Defeat the invaders in Apprentice Mode
Defeat the invaders in less than 10 minutes
Defeat the invaders in Sage Mode
Defeat the invaders in less than 15 minutes.
Defeat the enemies in Exploration - Warrior mode
Defeat the enemies in Exploration, Sage mode
Defeat the enemies in Remnants 1
Protect the 2 altars from the invaders
Defeat the enemies in Remnants 2
Defeat the enemies in Remnants 3
Defeat the enemies in Remnants 4
Defeat the enemies in Remnants 5
Defeat the enemies in Remnants 6