Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Dynasty Warrior (130 points): Unlock all achievements.
Minnow K.O. (15 points): Defeat first rank and file soldier.
Weaponry K.O. (15 points): Defeat first Weaponry.
Officer K.O. (15 points): Defeat first Officer.
Budding General (15 points): Issue first command to Allied Officer.
Budding Strategist (15 points): Use first Card Tactic.
Victory Toast (15 points): Complete first Quest.
Blacksmith Patron 1 (15 points): Make first weapon.
Blacksmith Patron 2 (15 points): Power up first weapon.
Academy Disciple (15 points): Acquire first Chi Skill.
Workshop Patron (15 points): Make first Orb.
Online Venture (30 points): Connect to Online City for the first time.
Victory Banquet (30 points): Complete first online Quest.
Mutual Exchange (30 points): Trade Officer with another player for the first time.
Invincible General (30 points): Complete all Quests.
Weapon Collector (30 points): Collect all Weapons.
Chi Collector (30 points): Collect all Chi Skills.
Orb Collector (30 points): Collect all Orbs.
Card Collector (30 points): Collect all Officer Cards.
Treasure Collector (30 points): Collect all Treasures.
Legend Collector (30 points): Collect all Legends.
Grand Developer (60 points): Upgrade all City Facilities to maximum.
Grand Strategist (60 points): Use all Card Tactics.
Grand General (60 points): Reach Level 50.

Additionally, there are eight secret achievements:

Secret achievement (15 points): Unknown.
Secret achievement (15 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (30 points): Unknown.
Secret achievement (60 points): Unknown.