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