Here is the full list of all 12 Riddlord: The Consequence achievements.
Complete level 2 without using hints
Solve all the secrets in the game
Find the secret in the second level
Find the secret in the third level
Complete level 1 without using hints
Find the secret in the first level
Complete level 1 in 20 minutes
Complete the entire game without using hints
Complete level 3 without using hints
Complete level 2 in 20 minutes
Complete level 3 in 20 minutes
Complete the game in 1 hour