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