Lost Odyssey

Like the other "Skill Master" achievements [Kaim, Sarah, Ming], this achievement requires Seth to learn all of the skills in the game using Skill Link from the accessories and learning the skills from the mortals. There are 165 skills in the game to learn. You must also collect all 99 seeds in the game to get an accessory from the pipot.

Captainamerica has supplied the following list of all skills, the site http://www.lost-odyssey.net/seedlist.php supplies a list of all of the seeds, and INVAL1D supplies an amazing step-by-step walkthrough on how to find all of the treasures (such as accessories) at http://www.gamefaqs.com/console/xbox360/file/928334/51928.

Don't forget some accessories needs the Skill Special Accessory or Royal Equipement to be equipped.
Most of the Mortal reach all theirs skills at level 52 (Tolten at 49).

SPECIAL

Double Item (From SED)
Absorb Transfer (From JANSEN)
Drain Shower (From JANSEN)
Counter (Combat Teachings)
Spell Counter (Warrior Armband)
Weapon Guard (Sword Teaching)
Absorb Attack (Amulet)
Absorb Magic (Talisman)
MP Guard (From TOLTEN)
Persistence (From TOLTEN)
Counter Guard (From TOLTEN)
Absorb Guard (From TOLTEN)
Guard Heal (Platinum Gauntlet)
Relax (Circlet)
Stand Ready (Knight Code)
Power Guard (From TOLTEN)
Lucky GC Ignore (From SED)
Auto Shield (Golden Gauntlet or From SED)
Auto Barrier (Royal Emblem or From SED)
Auto HP Recovery (White Charm)
Auto MP Recovery (Crystal Fragment)
Double back (Twin Cross)
Counter Up (Black Belt)
Angel Heart (From COOKE)
Resourceful (From SED)
Potion Booster (Herbalist Badge)
Double Gold (From SED)
Double Loot (From SED)
Double EXP (From SED)
Double SP (From SED)
2 Accessories (From JANSEN)
3 Accessories (From SED)
Special Accessory (From SED)
Royal Equipment (From TOLTEN)
Black Staff (From JANSEN)
White Staff (From COOKE)
Factual Analysis (Hawk Eye)
Status Analysis (Search Glasses)
Treasure Analysis (Treasure Glasses)
Ultimate Analysis (From SED)
Critical Heal (Lucky Clover)
Critical Defense (Holy Guard)
Crisis Concentration (Sage Protection)
Crisis Prayer (Happy Flower)
Crisis Attack Boost (Berseker Necklace)
Crisis Defense Boost (Holy Knight Charm)
Lucky 0 Magic Damage (Mimint Ear)
Weapon Guard 2 (Special Download Content - Master Script)

PARAMETER

Slot +3 (Awakening Bracelet)
Slot +5 (Freedom Armband)
Slot +10 (1000 Years of Memories)
HP Max 1 (Life Brooch)
HP Max 2 (Toughness Brooch)
HP Max 3 (Gigantes Brooch)
HP Max 4 (Royal Knight Emblem)
MP Max 1 (Mana Earring)
MP Max 2 (Mind Bangle)
MP Max 3 (Sorcerer Bracelet)
MP Max 4 (Kelonga Crown)
Attack Boost 1 (Power Bangle)
Attack Boost 2 (Ogre Bangle)
Defense Boost 1 (Knight Earring)
Defense Boost 2 (Lord Earring)
Magic Defense Boost 1 (Pixie Flower)
Magic Defense Boost 2 (Elfin Charm)
Evade Up (Kelolon Badge)

MAGIC

Double Cast (From JANSEN)
Mental Stability 1 (From COOKE)
Mental Stability 2 (From COOKE)
Reduce Casting Time 1 (From COOKE)
Reduce Casting Time 2 (From COOKE)
MP Conservation (Bracelet of Efficiency)
Lv 1 White Magic (From COOKEorFromJANSEN)
Lv 2 White Magic (From COOKEor From JANSEN)
Lv 3 White Magic (From COOKE)
Lv 4 White Magic (From COOKE)
Lv 5 White Magic (From COOKE)
Lv 6 White Magic (From COOKE)
Lv 7 White Magic (From COOKE)
Lv 8 White Magic (From COOKE)
Lv 1 Black Magic (From JANSEN)
Lv 2 Black Magic (From JANSEN)
Lv 3 Black Magic (From JANSEN)
Lv 4 Black Magic (From JANSEN)
Lv 5 Black Magic (From JANSEN)
Lv 6 Black Magic (From JANSEN)
Lv 7 Black Magic (From JANSEN)
Lv 8 Black Magic (From JANSEN)
Lv 1 Black-White Magic (Novice Earrings)
Lv 2 Black-White Magic (Apprentice Earrings)
Lv 3 Black-White Magic (Adept Earrings)
Lv 4 Black-White Magic (Sorcerer Earrings)
Lv 5 Black-White Magic (Earring of Wisdom)
Lv 6 Black-White Magic (Wisdom Earrings)
Lv 7 Black-White Magic (Sage Earrings)
Lv 8 Black-White Magic (Master Earrings)
Lv 1 Spirit Magic (Eastern Spirit Bandor From MACK)
Lv 2 Spirit Magic (Bronze Spirit Band or From MACK)
Lv 3 Spirit Magic (Red Copper Band or From MACK)
Lv 4 Spirit Magic (Gold Spirit Band or From MACK)
Lv 5 Spirit Magic (Obsidian Spirit Band or From MACK)
Lv 6 Spirit Magic (Diamond Spirit Band or From MACK)
Lv 7 Spirit Magic (Enchanted Necklace or From MACK)
Lv 8 Spirit Magic (Cursed Crest or From MACK)
Lv 1 Composite Magic (Magic Research Report)
Lv 2 Composite Magic (Magic Trial Record)
Lv 3 Composite Magic (Magic Analysis Book)
Lv 4 Composite Magic (Composite Magic Book)

COMMAND

Turn Tail (Turn Tail Shoes or From SED)
Steal (From JANSEN or From SEDorThief Bracelet)
Taunt (From SED or From MACK)
Stand Firm (10 Kilo Weight orFrom MACK)
Complete Defense (From TOLTEN)
Casting Suport (From COOKE)
Concentrate (From COOKE)
MP Gift (From TOLTEN)
Huge MP Gift (From TOLTEN)
MP Convert (From COOKE)
Prayer (From COOKE)
Lullaby (From TOLTEN)
Award Medal (From TOLTEN)
Magic Seal (From SED)
Counter Seal (From SED)
Power Hit (From MACK or From TOLTEN)
Break Hit (From TOLTEN)
Member Hit (From TOLTEN)
Skill Hit (Scroll Of Secret Skills)
Slot Hit (Scroll Of Balance)
Combo (From MACK)
3 Combo (From MACK)
Ultimate Hit (From TOLTEN)
Cut Down (Scroll of Dissection or From TOLTEN)
All Hit (From TOLTEN)
Wall (From MACK)
Walla (From MACK)
Wallus (From MACK)

STATUS AILMENTS

Anti-Kelolon (Kelolon Earring)
Anti-Poison (Antidote Brooch)
Anti-Terror (Lionheart)
Anti-Darkness (White Flame Candle)
Anti-Seal (Seal Blocker)
Anti-Freeze (Warm Vest)
Anti-Paralyze (Yellow Band)
Anti-Sleep (Alarm Clock)
Anti-Dizzy (Stabilizzer)
Anti-Curse (Curse Blocker)
Anti-Petrify (Medusa Head)
Anti-Blind (Light Lens)
Freeform (General Pen)
Ailments Resistance (Angel Guard)

ELEMENTS

Reduce Earth (Earth Charm)
Reduce Fire (Fire Charm)
Reduce Water (Water Charm)
Reduce Air (Air Charm)
Earth Proof (Ochre Earth Amulet)
Fire Proof (Blazing Fire Amulet)
Water Proof (Ice Water Amulet)
Air Proof (High Wind Amulet)
Absorb Earth (Pipot Collar)
Absorb Air (Anereid Feather)
Absorb Fire (Sarah Notebook)
Absorb Water (Blue Dragoneye)
Reduce Elements (Quad Elements Charm)
Nullify Elements (Quad Elements Bracelet)
Absorb Elements (Quand Elements Seal)