Here is the full list of all 50 Guitar Hero: Warriors of Rock achievements worth 1,000 gamerscore.
Tried out some Competitive games
Bettered your own grade
Played any song 10 times
Laid down 100 notes in GH(tm)Jam
5-starred 5 chosen songs
Hit 150,000 notes in Quest
Supported the GH(tm)Tracks community
Earned Diamond on 2 challenges at once
Full-Comboed a tutorial exercise
Earned 500 Stars in QP+
Dominated all character chapters
Earned Gold on 3 challenges at once
Earned 100 Stars in QP+
Dominated 2 chapters
Dominated 4 chapters
Hit 75,000 notes in Quest
Charmed Warrior Casey (Quest)
Awakened Warrior Axel (Quest)
Freed the Demigod of Rock
Defeated the scourge of Rock
Dominated a song in Quest
Stole the Spotlight
Regained the Legendary Guitar
Invoked Warrior Austin (Quest)
Released Warrior Lars (Quest)
Summoned Warrior Pandora (Quest)
Collected at least 115 songs
Unleashed Warrior Johnny (Quest)
Earned a score which is evenly divisible by 6
Earned Gold on 2 Band Challenges at once
Recruited Warrior Judy (Quest)
Liberated Warrior Echo (Quest)
Follow any five Hero Feed items (Xbox LIVE only)
Target another person's score on any Challenge and earn a higher grade than they did (Local QP+)
Earn all Stars from any one song (excluding the Power Challenge) (QP+)
Earn an 11x Band multiplier with any 4-player Band configuration (QP+)
5-Star any song as a 4-player Non-Standard Band, with all players on Medium or higher (QP+)
5-Star any song as a 4-player Standard Band, with all players on Medium or higher (QP+)
Earn 1,000,000 points or more in a single play of a song in a Power Challenge (QP+)
Create and play a 5-song random playlist, earning 5 Stars on each song (QP+)
Beat any song with a final score of 133,337 (QP+, Competitive)
Beat any song with a final score ending in 000 as a Band (QP+)
Earn a total of 1000 Stars (QP+)
Earn a total of 2000 Stars (QP+)
Complete a song with only a Guitarist and Bassist, both earning the same score (QP+)
Beat Bohemian Rhapsody as a band with all on Medium or higher, and at least 2 vocalists (QP+)
Beat 2112 Part 4 as a Standard band with 3 or more members, all on Medium or higher difficulty (QP+)
Beat Holy Wars... The Punishment Due as a solo Bassist on Hard or higher difficulty (QP+)
Beat Fury of the Storm as a solo Drummer on Hard or higher difficulty (QP+)
Beat Black Widow of La Porte as a solo Expert Guitarist (QP+, no Powers)