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