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