Here is the full list of all 22 SkyScrappers achievements.
Complete a four-player multiplayer game with all human players
Complete all the single player campaigns
Complete the single player campaign as Jessica
Complete the single player campaign as Kichirou
Complete the single player campaign as Solene
Do a slide trick
Complete the single player campaign as Phileas
Win a game without losing any health
Finish a game with a weapon attack
Do a special move attack
Do a long jump trick
Do a jump of over 15m from an inclined platform
Strike a flaming object into another character
Hit an opponent with a ground pround attack
Completely fill your super bar
Strike a falling object into another character
Do a special move jump
Do a vertical rush trick
Do a three point landing trick
Win a game by landing on the roof of a building
Win a match for the first time
Win your first round