How to get The Professional Achievement/Trophy
To get The Professional achievement/trophy you need to kill all the enemies in a zone. You will be able to do this in the prologue where there are between 30-35 enemies to kill on the map. To increase your chances of doing this it is recommended that you use stealth tactics, so you don't draw the attention of guards. You can find out if you have missed any enemies by pressing Up on your D-Pad to make Styx whistle. Doing this will alert nearby enemies and display their 'alertmeter' which depending on their state of alertness will appear as a white, yellow or red circle which you can then use as a guide to locate them. The achievement/trophy will unlock once you have killed all the enemies and left the area.
If you need more help, we've got more Styx: Shards of Darkness cheats and also check out all of the answers for this game
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