Here is the full list of all 46 Tony Hawk's Proving Ground achievements worth 1,000 gamerscore.
Completed all Classic Goals at SICK
Completed all Line Goals at SICK
Completed all Hawk-man Goals at SICK.
Found all Gaps on gap list.
Complete all Skill Challenges at SICK.
Completed all goals at PRO ranking or better.
Play 1000 games.
Completed all Line Goals at PRO ranking or better.
Completed all Skill Challenges at PRO ranking or better.
Completed all Classic Goals at PRO ranking or better.
Completed all Hawk-man Goals at PRO ranking or better.
Complete all Film goals at SICK
Modified all environment areas.
Found all the cash spots.
Win enough wagers to accumulate $100,000 in winnings. Ranked Match only.
Completed all Photo Goals at SICK
Won all rounds in a five round match vs. at least 4 gamertags.
Made a Video Edit worth 20,000 Points
Completed all Film Goals at PRO ranking or better.
Completed all Photo Goals at PRO ranking or better.
Completed all goals at AM ranking or better.
Completed all Classic Goals at AM ranking or better.
Completed all Lifestyle Uber Goals.
Completed all Hawk-man Goals at AM ranking or better.
Purchased all Skater Gear.
Completed all Skill Challenges at AM ranking or better.
Stevie's Nail the Manual episode completed.
Upgraded all skater skills.
Completed all Photo Goals at AM ranking or better.
Completed all Film Goals at AM ranking or better.
Jeff's Rigging episode completed.
Completed all Line Goals at AM ranking or better.
Daewon and Rodney's Modify the World episode completed
Bam's Climbing episode completed.
Achieved 'Team Built' Game Milestone.
Lance's Bowl Skating episode completed.
Mike V's Go Epic episode completed.
Dustin's Skate Checking episode completed.
Achieved 'Build Your Team' Game Milestone.
Achieved 'Get Your Own Skate Shoe' Game Milestone.
Knocked baddie 150 feet.
Achieved 'Get Your Own Skate Deck' Game Milestone.
Achieved the 'Join Team' Game Milestone.
Bob's Nail the Grab episode completed.
Arto's episode completed.
Achieved the 'Sponsored' Game Milestone progress.