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