Here is the full list of all 12 Marble Mountain achievements.
Find the resting place of Mr Jones
Completed 'Graveyard Depths' without slowing down the blades
Make it across the Trap Door Puzzle in under 7 seconds in 'It Burns'
Achieve Max Speed
Cause 50 evil skulls to fall to their death
Fall at least 10 kilometres over any number of playthroughs
Finish 'Loot the Temple' the quick way.
Finish the game
Finished all Levels with Gold Banner
Complete all levels in under 80 minutes
Finish all Levels without dying
Launch from the treetop