Defeated 20 consecutive enemies, without being hit
This is obviously easier on lower difficulties and also the further you are upgraded. I would at least recommend using the explosive or cold plasma to speed enemy deaths up/or lock them in place. The best way to do this whilst playing casually, is to take your time and try to reflect/jump over any incoming gunfire. Fighting one enemy at a time certainly makes this easier. I personally got this on one of the games many long corridors that house 5-6 enemies at a time. I went through carefully, freezing enemies and reflecting bullets whilst killing them one by one until all twenty were dead.
For an easy method, you can earn this right at the start of the game. After getting the slide ability, you can exit the room, kill four enemies then return to the upgrade point. When you exit, the enemies will have repsawned and you can repeat until you have unlocked your achievement.
I've included a video I made showing you how and where to use this method.
It consists in killing 20 enemies without getting hurt. You can get it easily just at the beginning of the game. The easiest and fastest way to get it is starting a new game (no matter the difficulty) and right in the beginning area take advantage of the respawn of the enemies.
At the beggining of the video I speak in Spanish but it's just and introduction and I don't say anything relevant. If anyone make a negative vote please tell me why, so I can improve my future videos.
There is a part later in the game where flying robots fly up from a hole in the ground. I believe it's in the sewers when you're shutting off the water valves. Make sure not to close it, literally sit right over it and keep attacking. They will continuously fly out until you plug the hole.
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