The Eldfjall Island Add-on for Lonely Mountains: Downhill has 7 achievements.
Cross your first finish line on Eldfjall
Complete all beginner challenges during daytime on Eldfjall
Complete all expert challenges during daytime on Eldfall
Complete all challenges during daytime on Eldfjall
Complete all challenge during night-time on Eldfjall
Find all resting places on Eldfjall
Fall into lava 20 times on Eldfjall