Full list of all 41 Majin and the Forsaken Kingdom achievements worth 1,000 gamerscore.
Save the Majin
Escape from the Dark Castle
Defeat Caprakan
Defeat B'alam
Defeat Tlaloc
Defeat Ixtab
Defeat the "Creator of All Darkness"
Go to the true ending
Give the Majin more than 500 orders
Feed the Majin over 10 Blue Fruit
The Majin acquires "wind" ability
The Majin acquires "lightning" ability
The Majin acquires "flame" ability
The Majin acquires "purification" ability
The Majin's "health" ability rises to maximum
The Majin's "strength" ability rises to maximum
The Majin's "wind" ability rises to maximum
The Majin's "lightning" ability rises to maximum
The Majin's "flame" ability rises to maximum
The Majin's "purification" ability rises to maximum
Defeat over 100 enemies
Defeat over 500 enemies
Defeat over 30 enemies with traps
Open all Treasure Chests
Have the Majin revive you 3 times.
Talk to the Majin 100 times.
Help the Majin out when he's in trouble 10 times.
Help the Majin out when he's in trouble 30 times.
Become "haunted by darkness" 10 times.
Attack shielded enemies 100 times.
Defeat 50 enemies with sneak attacks
Defeat 300 enemies with combination attacks
Defeat more than 50 enemies with finish attacks
Defeat 5 or more enemies at once using a finish or combination attack
Defeat over 10 enemies with a wind finish attack
Defeat over 10 enemies with a lightning finish attack
Defeat over 10 enemies with a flame finish attack
Defeat over 10 enemies with a purification finish attack
Get 3 full costume sets
Get all costumes
Raise Friendship level and Tepeu's level to max