The final release of Dragon Quest: Legacy of the Lost will feature an Achievement System. There will be some pretty interesting rewards from the system and I think it will be fun for many people to try and collect them all. So far, here is my list of achievements. :)

I am the Ultimate Mage!: Acquire an essence of Mega Magic.
Monster Master: Recruit 4 monsters to your team.
Monster Master II: Recruit 8 monsters to your team.
Professional Scout: Utilize the services of three monster masters.
I'm Too Good to Level Slowly!: Acquire the Expediter accessory.
Demon Lords will Follow My Orders!: Successfully breed a BOSS monster.
Wrath of a Monster Master: Acquire Gold Coat, Tiamat's Fang, The Eternal, Rosevine's Grasp, Arachnio, Excalibur, Hydraulix, or Demon's Volition.
Treasure Gambler: Master the Treasure Chest Game.
This is Yardrick!!! (Past)!: Complete the arena in the past.
This is Yardrick!!! (Present Day): Complete the arena in present day.
Relic Master: Acquire Shield of Loto, Tuspimati, Gastraphetes, or Ragnarok.
Power to Rival the Gods: Aqcuire Thor's Blade, Spirit Surge, Arcane Benison, or Runic Aurora.
Big Gambler: Master the Casino.
I Can't Do This Alone!: Recruit 4 human characters to your team.
The Power of Clergy: Unlock Melody's full potential.
One Mans Trash is Another Womans Treasure I!: Bring the Tinymedal Woman 10 medals.
One Mans Trash is Another Womans Treasure II!: Bring the Tinymedal Woman 20 medals.
One Mans Trash is Another Womans Treasure III!: Bring the Tinymedal Woman 30 medals.
One Mans Trash is Another Womans Treasure IV!: Bring the Tinymedal Woman 40 medals.
I Know Myself!: Attain an Honesty meter of 20 OR Dishonesty of 20.
I Love a Zombie: Acquire two monsters of the ZOMBIE family.
I Love a Slime: Acquire three monsters of the SLIME family.
I Love ALL families: Acquire a monster from every monster family.
Savior of Araginol: Complete the game.
I Collect Herbs: Synthesize every type of item through herb hunting.
Extreme Town Makeover: Rebuild Onyu.
Who Needs the Church?: Make it to Achievement Man without using church services.