Here is the full list of all 50 Guitar Hero: World Tour achievements worth 1,000 gamerscore.
You performed as a Vocalist
You performed as every instrument at least once
You completed a song in a band
You created a custom tattoo
You created your own custom drums
You created your own custom guitar
You created you own band logo
You created a female band member
You created a male band member
You rocked out as Hayley Williams
You rocked out as Ted Nugent
You rocked out as Zakk Wylde
Get the highest score in the band as the lead or bass guitar (4 player band)
All band members activated star power at the same time
You scored 444,444 or more on the song Schism
You completed an Xbox LIVE Band v Band match
You completed a band career
You rocked out as the Skeleton
You completed all of the instrument careers
You rocked out as the Rockubot
You rocked out as Travis Barker
You scored 222,222 or higher on the song Assassin as a Drummer
You got the highest score in a band as the vocalist
You scored 444,444 or more on the song Trapped Under Ice
All band members got a 50 note streak at the same time
You rocked out as Billy Corgan
You scored 123,450 or higher on the song Beat It as a Vocalist
You unlocked all of the guitars
You rocked out as Ozzy Osbourne
You completed an Xbox LIVE 2 v 2 Pro Face-Off match
You completed an Xbox LIVE Battle Mode match
You scored 222,222 or higher on the song Satch Boogie as the Lead guitarist
You uploaded a song to GHTunes
You completed Career on expert
You completed Career on hard. Have you tried expert yet?
You completed Career on medium. Have you tried hard yet?
You completed Career on easy. Have you tried medium yet?
You completed a solo career
You rocked out as Jimi Hendrix
You completed the majority of the gigs. Just a few more to go.
You completed a tutorial
You downloaded a few songs from GHTunes
You performed as a Guitarist
You completed a gig
You performed as a Drummer
You completed a song solo
Earn $1,000,000 in lifetime earnings
100% a song as a band (4 player band)
100% a song as a band, hard or expert only (4 player band)
All band members earn an 8x multiplier at the same time (4 player band)