The Riley's Return Add-on for Lonely Mountains: Downhill has 7 achievements.
Cross your first finish line on Lostman's Grove
Complete all beginner challenges on Lostman's Grove
Complete all expert challenges on Lostman's Grove
Complete all challenges during daytime on Lostman's Grove
Complete all challenge during night-time on Lostman's Grove
Find all resting places on Lostman's Grove
Cross the finish line of Lostman's Grove with all bikes.