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