Here is the full list of all 28 CODE SHIFTER achievements worth 1,000 gamerscore.
Clear all the stages in Mozzie's folder at least once
Clear all the stages in Rudy's folder at least once
Clear all the stages in Hudson's folder at least once
Clear all the stages in Greig's folder at least once
Clear all the stages in Stella's folder at least once
Complete all the missions in Mozzie's folder
Complete all the missions in Rudy's folder
Complete all the missions in Hudson's folder
Complete all the missions in Greig's folder
Complete all the missions in Stella's folder
Complete all the missions
Play VS mode at least once
Play VS mode 30 times
Clear the stage for the first time in Co-op Mode
Clear the stage for the first time in Story Mode
Clear the stage 20 times in Story Mode
Clear the stage 100 times in Story Mode
Land a 30 combo hit without being interrupted
Land a 300 combo hit without being interrupted
The heroine uses a total of 5 special attacks in Story Mode
The heroine uses a total of 100 special attacks in Story Mode
The heroine uses a total of 30 Hero Code special attacks in All Modes
The heroine uses a total of 300 Hero Code special attacks in All Modes
Summon Assist Characters 10 times in All Modes
Summon Assist Characters 500 times in All Modes
Take out 30 enemies
Take out 300 enemies
Destroy 3000 Enemies