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