1)Mission ranking system(not suitable for all missions), total ripoff from tony hawk's project 8
Comlete the mission in 38 seconds, you get rank c; 35 sec - rank b; 32 sec - rank a, 30 sec - rank S. Also there are some missions you can do without touching a ground but not necessairly. For those types of missions if you touch a ground, you just get lower rating (non S).
2)Ingame achievements.
-Complete 10 missions within rank S
-spray all 126 spots
-spray all cameras
- ride on the vehicle from the mountain
-ride X coloured pipe in the underground/ride all the pipes in the underground
-get to the butterflies's observatory hideout (that's definitely a achievement)
-ride Eifel's tower from the top to the ground
-complete adventure mode 100%
-complete adventure mode 100% under 45 minutes(for example)
-complete challenge mode X spots in X minutes
-complete challenge mode X spots without getting hit by cameras/keisatsu