Speed Kill Achievement
Kill 10 generic enemies before they spawn.
When you’re climbing or wallrunning to certain places you’ll encounter enemies (like duh). Sometimes you’ll see black light shooting out of the ground meaning a spawn point for an enemy. If you’re fast enough and reached a place where an enemy is about to spawn you can simply press the button next to the black light to kill this enemy.
Do this a total of 10 times to unlock the achievement. There are more than enough fights like this during a single playthrough.