Here is the full list of all 26 Hitman GO: Definitive Edition achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Used a hint, ignored the instructions but finished the level...
Complete all objectives in all chapters without using a single hint.
Complete all objectives in the St. Petersburg Stakeout Chapter.
Kill 100 enemies using the Silverballers.
Complete all objectives in the sixth chapter.
Kill 100 Pair (Grey) enemies.
Get pushed 100 steps.
Kill 100 Turning (Teal) enemies.
Play for at least 5,000 turns.
Die at least 200 times.
Kill 100 Patrol (Yellow) enemies.
Kill 100 Static (Blue) enemies.
Complete all objectives in the opera chapter.
Play for at least 1,000 turns.
Get chased by three guard dogs simultaneously.
Worn all three disguise types.
Killed an enemy by emerging from a Secret Passage.
Play for at least 100 turns in a single level.
Crush three enemies under a falling statue.
Complete all objectives in the fourth chapter.
Complete all objectives in the third box.
Complete all objectives in the second box.
Complete all objectives in the first box.
Throw an object without alerting anyone.
Kill 5 enemies at once.
Killed 2 enemies at once.