Here is the full list of all 18 Pahelika: Revelations HD achievements.
For completing the full game within 120 minutes
Complete the entire game twice
Use skip button to skip all the minigames
Place the rod in the first slot in the Uncle Rajat's house
Use the skip button to skip any minigame
Play any stage/level with cheats enabled
Complete entire game
Complete entire game without using hints
Complete all minigames, without skipping any one of them
Solve all the puzzles in the game, including the optional box puzzle in Stage 1
Complete Stage 5
Complete Jigsaw Puzzle Minigame within a minute, without pressing the skip button
Complete Stage 4
Solve Story Arrangement Puzzle without using skip button
For Completing a stage within 5 minutes
Complete Level without using a hint
Complete Stage 1
Complete the tutorial