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