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