Here is the full list of all 18 Star Wars: Battle for Hoth achievements worth 200 gamerscore.
Complete all levels Classic/Easy
Complete all levels Classic/Easy/Wipe Them Out
Complete all levels Classic/Normal
Complete all levels Classic/Normal/Wipe Them Out
Complete all levels Fortress/Easy
Complete all levels Fortress/Easy/Wipe Them Out
Complete all levels Fortress/Normal
Complete all levels Fortress/Normal/Wipe Them Out
Kill an AT-AT.
Kill 10 AT-ATs.
Build Tower and Power Generator to supply it
Kill 10 TIE Fighters using X-wing fighters.
Build at least one of all types of technology
Complete at least 5 levels with Wipe Them Out
Get 6,000+ CP Bonus Points from one level
Get total 50,000+ CP Bonus points, any levels
Score 40,000+ Points on single level
Get total 500,000+ points, any levels