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