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...
Play for at least 5,000 turns.
Die at least 200 times.
Complete all objectives in all chapters without using a single hint.
Complete all objectives in the opera chapter.
Kill 100 Turning (Teal) enemies.
Kill 100 Pair (Grey) enemies.
Complete all objectives in the St. Petersburg Stakeout Chapter.
Complete all objectives in the sixth chapter.
Kill 100 Patrol (Yellow) enemies.
Get pushed 100 steps.
Complete all objectives in the fourth chapter.
Crush three enemies under a falling statue.
Get chased by three guard dogs simultaneously.
Kill 100 enemies using the Silverballers.
Complete all objectives in the third box.
Complete all objectives in the second box.
Kill 100 Static (Blue) enemies.
Play for at least 1,000 turns.
Worn all three disguise types.
Play for at least 100 turns in a single level.
Killed an enemy by emerging from a Secret Passage.
Complete all objectives in the first box.
Kill 5 enemies at once.
Throw an object without alerting anyone.
Killed 2 enemies at once.