Here is the full list of all 48 Session: Skate Sim achievements.
Perform [1001] Kickflips
Visit all cities apartments (HUB)
Complete the tutorial
Complete all the pros challenges (All pro story arcs)
Complete all historical challenges
Reach Pro status with “Manual” catch ON (From 1st quest to Pro)
Complete all the historical challenges in NYC (Includes Pyramid Ledges, Black Hubba, LES Coleman, Highline Bridge, Jerome Banks)
Complete all the historical challenges in Philadelphia
Complete all the historical challenges in San Francisco
Slide / Grind for a total of [42] Km
Reach Shop sponsored status
Reach Flow status
Reach Am status
Reach Pro status
Manual for a total of [21] km
Completed all RIBS MAN missions
Complete all Dane Burman missions
Complete all Daewon Song missions
Complete all Antiferg missions
Complete all Annie Guglia missions
Complete all Manny Santiago missions
Complete all Torey Pudwill missions
Complete all Jahmir Brown missions
Complete all Billy Marks missions
Complete all Donovan Strain missions
Complete all Mark Appleyard missions
Complete all Beagle missions
Complete all Louie Barletta missions
Complete all Ryan Thompson missions
Complete all Nora Vasconcellos missions
Complete all Samaria Brevard missions
Buy [50] DIY items from the shop
Perform [500] Laser Flips
Perform [500] Inward Heelflips
Perform [1001] Heelflips
Perform [500] 360 Flips
Perform [500] Hardflips
Perform [500] Smith grinds
Perform [500] Feebles
Perform [500] 50-50
Perform [500] Crooked grinds
Perform [500] Tailslides
Perform [500] Noseslides
Perform [500] 5-0 grinds
Perform [500] Nose grinds
Perform [500] Boardslides
Perform [500] Lipslides
Buy [100] customised items at the shop