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

The End (20 points): Complete the story.
The Stranger (10 points): Complete the Wharf District.
Pet Sitter (10 points): Get four different domesticated creatures in the Bastion.
Vigilante (10 points): Complete at least 50 percent of the Vigils in the Memorial.
Altruist (20 points): Complete 100 percent of the Vigils in the Memorial.
Calamity Kid (30 points): Complete the story in New Game Plus.
Mind Voyager (20 points): Complete each trip to Who Knows Where.
Kid-at-Arms (10 points): Use the Forge to apply at least one upgrade to every weapon.

Additionally, there are four secret achievements:

The Ura (20 points): Stop the siege on the Bastion.
The Beginning (20 points): Complete the story, embracing the New World.
The Survivor (10 points): Complete the Hanging Gardens and speak with the Survivor in the Bastion.
The Singer (20 points): Complete Prosper Bluff and speak with the Singer in the Bastion.