Here is the full list of all 41 ScreamRide achievements worth 1,000 gamerscore.
Completed the First Engineer level
100% all Demolitons Expert levels
Demo Expert: Passed through 100 hoops
Generated a total Scream Rating of over 250,000,000 in the campaign
Demo Expert: Gained a Scream Rating total of 100,000,000
Completed all Demolitions Expert levels
Demo Expert: Caused over 1,800,000 damage in a campaign level
Demo Expert: Destroyed the helicopter
Demo Expert: Launched a coaster car more than 300m
Demo Expert: Launched 500 cabins
Demo Expert: Sent a car or cabin through a goal post.
Demo Expert: Caused 20+ explosions in a campaign level.
Demo Expert: Launched a cabin over 500m
Demo Expert: Destroyed the blimp
Demo Expert: Skimmed a cabin 5 times
Completed the First Demolitions Expert level
Demo Expert: Destroyed the speed boat
100% all ScreamRider levels
Completed all ScreamRider levels
ScreamRider: Got 1,000 Perfects
ScreamRider: Spent a total of 30 minutes on two wheels
ScreamRider: Spent 20 consecutive seconds on two wheels
ScreamRider: Got 25 Perfect landings
ScreamRider: Got 10 Perfects in a Row
ScreamRider: Crashed your coaster
Completed the First ScreamRider level
ScreamRider: Got a Perfect start
Complete Series 1
Complete Series 2
Complete Series 3
Complete Series 4
Complete Series 5
Complete Series 6
Complete all Engineer levels
100% all Engineer levels
100% all Campaign levels
Engineer: Build a coaster that achieves over 30 g
Engineer: Eject 500 riders
Engineer: Build a coaster that exceeds 150mph
Engineer: Build a coaster with a drop height of 190m
Engineer: Place down 10km of track