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