Hitman: Absolution
46 Achievements
1,000
15-20h
Inconspicuous
You remained undetected throughout a checkpoint
20
How to unlock the Inconspicuous achievement in Hitman: Absolution - Definitive Guide
Edit [6/23/2022]: It looks like the dev contracts are no longer live and this is no longer a viable solution unless they decide to activate the dev contracts again at some point in time (thank you to HyruleBalverine for this information!)
all you gotta do is go to the top left corner of the map, there will be 3 policemen, wait for 2 of them to walk away then subdue the remaining guy, dump his body in the box behind you.
just wait here for around 1 minute and the target will come over and take a leak in the corner. Now is your chance, kill him with the wire and dump his body in the box as well. now exit through the door right next to you and ......achievements unlocked. you will also get silent assassin and 2 other achievements for finishing the level.
This can be done on any mission except the prologue (Mission 1: A Personal Contract). There are different "areas" in the missions which act as main checkpoints. Go through an entire area without ever being spotted and this achievement will unlock upon the next checkpoint or completing the level (if there was none after). The first time you can get this is in Mission 2: The King of Chinatown. To the right of the area where the target is, there is a area with chefs and they are selling food. Find the chef with the red apron (a female). Behind her is an odd looking dish with poisonous fish. After she turns her back, grab it. Now go North to where there is 2 chefs and a police guard. On the right, sneak in and find the disguise near the garbage. Walk to the middle area where the target has likely left. Poison his coffee and walk away. After he goes back and drinks the coffee, you are free to exit the level. You will also get the "Silent Assassin" achievement.
You can do this in a variety of ways:
1. Hide using whenever the "hide" option is available.
2. Keep going from cover to cover by hitting
3. Sneak past enemies or distract them with for instinct or for throwing an object.
Note: This cannot be achieved on the very first tutorial level.
You'll more than likely just get this by playing the game, as the main objective is to be stealthy. You have to complete a checkpoint without being spotted, you'll know if you get spotted as it will say "Spotted -1200". To avoid getting spotted, use silenced ways of killing enemies and don't draw attention to yourself. You can also throw objects to get enemies to move from their post, this makes the trophy very easy as you can distract enemies and then sneak past them, thanks to Rawra for suggesting that tip.