Here is the full list of all 37 Magus trophies - there are 26 bronze, 5 silver, 5 gold and 1 platinum.
Obtain all trophies.
Obtain 100 Health Potions.
Max out the levels of all the Red Magic skills.
Max out the levels of all the Blue Magic skills.
Max out the levels of all the Green Magic skills.
Obtain 500 Items.
Kill 100 Titans.
Kill 100 Unicorns.
Kill 100 Obsidian Guard.
Kill 100 Undead.
Reach level thirty.
Defeat the Daemon Queen.
Kill 100 Shai Soldiers.
Kill 1000 Enemies.
Defeat the King.
Complete Azure Cove map.
Kill 100 Dragonmen.
Reach level twenty.
Equip a Rune for the first time.
Extract Item attributes to a Scroll.
Have Usoph the Unicorn Elder join your cause.
Complete Mines map.
Have the titan runemaster Vallos join your cause.
Complete Desert map.
Complete Burial Grounds map.
Kill 100 Skeletons.
Reach level ten.
Use a Chroma-Skill for the first time.
Unlock the "Raise Dead" skill.
Enter the Tower of the Gods.
Kill General Tiel and complete the Island map.
Kill 100 Kingdom Soldiers.
Add a Gem to an Item.
Kill Captian Rivers and complete the Dungeon map.
Kill Purifier Brooks.
Absorb the color from a power stone.
Have Kinna join your party.