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