Here is the full list of all 23 Candle achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Complete Act 3
Ignite all the fire spots throughout the adventure
Try to confront the monster on your own
Win the game and do not lose more than 1 token
Remember to turn off your candle while you are hidden
A mother always protects her children
Fire is not always your ally
This rings a bell...
Complete Act 2
Spread the blue fire as much as possible
Survive underwater for over a minute
Your candle is not THAT powerful
Monkeys don't want to be disturbed
Jumping is not always possible
Complete Act 1
Fall into the same trap twice
Escape from a chasing Wakcha
I'm sure this is not what you wanted to do here...
Drop from a high spot and stay alive
Use the light burst power of your candle to unveil a hidden painting
Jump over a Wakcha
Think carefully how to protect yourself from that rock
Your journey is just beginning...