There are 42 Trophies that can be collected.

Bronze

Master of the Majin
Give the Majin more than 500 orders.

Majin Healer
Feed the Majin over 10 Blue Fruit

Dark Hunter
Defeat over 100 enemies

Trap Master
Defeat over 30 enemies with traps

Immortal Man
Have the Majin revive you 3 times.

Chatterbox
Talk to the Majin 100 times.

Majin Bodyguard
Help the Majin out when he's in trouble 10 times.

One Enthralled by Darkness
Become 'haunted by darkness' 10 times.

Headlong Rush
Attack shielded enemies 100 times.

Sneak Master
Defeat 50 enemies with sneak attacks

Combination Master
Defeat 300 enemies with combination attacks

Finish Master
Defeat more then 50 enemies with finish attacks

Cosplay Maniac
Get 3 full costume sets

Silver

Ultimate Health
The Majin's 'health' ability rises to maximum

Ultimate Strength
The Majin's 'strength' ability rises to maximum

One of a Kind
Defeat over 500 enemies

Treasure Hunter
Open all treasure chests

Majin Knight
Help the Majin out when he's in trouble 30 times.

Battle Master
Defeat 5 or more enemies at once using a finish or combination attack

Cosplay Master
Get all costumes

Gold

Brave One
Raise Friendship level and Tepeu's level to max

Platinum

Platinum!
You've acquired all the Majin and the Forsaken Kingdom trophies!

20 Secret

http://www.ps3trophies.com/forums/trophy-news/48135-majin-forsaken-kingdom-trophy-list.html