All of the achievements below will be completed if the follow my guide, except Magic Tactics and Weapon Tactics which require you to level up one magic spell and one weapon type to level 16 respectively. I will the strategy to the guide page to easily accomplish these.

Apprentice Warrior 
Defeated 100 monsters.

Password: Wild Rose 
The rebellion commenced against the Palamecian Empire. Obtain automatically as the game progresses.

Experienced Warrior 
Defeated 300 monsters.

Thrifty Spender 
Obtained 10,000 gil.

Field Research - Basic 
Completed 10% of the Bestiary entries.

Legendary Warrior 
Defeated 500 monsters.

Empire's Blitz 
The empire destroyed numerous towns with the Dreadnought.

Rookie Treasure Hunter 
Collected treasure from 10% of the chests.

Smart Saver 
Obtained 50,000 gil.

Moneybags 
Obtained 100,000 gil.

Counterattack 
Blew up the Dreadnought.

A Pirate's Mate 
Obtained a ship from the pirate Leila.

Rebel Victory 
Defeated Commander Gottos and reclaimed Castle Fynn.

Field Research - Advanced 
Completed 50% of the Bestiary entries.

Veteran Treasure Hunter 
Collected treasure from 50% of the chests.

Last Dragoon
Became allies with Ricard the dragoon.

Birth of a Wyvern 
Hatched the last wyvern egg.

New Palamecia 
The Dark Knight ascended the emperor's throne.

Allied Offensive 
Past allies joined the rebel army.

War's End 
Defeated the emperor and restored peace to the world.

Adventurous Wayfarer 
Traveled to all the map locations.

Memory Lane
Learned all passwords.

Sword of Myth
Obtained Excalibur.

Magic Tactics
Leveled up one magic spell to skill level 16.

Weapon Tactics
Leveled up one weapon type to skill level 16.

Legendary Treasure Hunter 
Collected treasure from 100% of the chests.

Field Research - Professional 
Completed 100% of the Bestiary entries.

Master of II 
Earned all achievements.