Getting wave 50 in onslaught is a nightmare? Wrong!
In this guide I will show you some tricks to get the achievement without any effort.
All you need is a good set up and some skill ;)

To be honest, this is THE MOST IMPORTANT PART of this guide.
Choosing right perks and game settings is essential to get the achievement.

1. Class editing

Lets start from making a custom class.
For weapons pick one machingun for your primary DPS source and sniper rifle for cleaning wave leftovers.

For perks go for:

PREDATOR - Must have. Perferct for tracking wurms and enemies that will spawn underground.

JETPACK - Core perk for this achievement. I will explain this one later in the guide.

PANDORA'S BOX - Helpful in preparation stage as you can roll multiple types of auto-turrets

AUTO TURRET - Helps to clean the mob spawn faster.

2. Map

Download this custom map I've made or try to make new one on your own. The point is to place all enemy spawners in the same corner of the map.

3. Game settings

Just follow the picture:

During the preparation phase just put your auto turrets near the enemy spawn corner and wait for first enemies to appear.

The key to the success is to use your jetpack the right way. You have to stay in the air for the whole duration of the game. Try to follow these steps:

1.) Fly as high as you can
2.) Turn off the jetpack and hold space bar to activate parachute
3.) Wait until jetpack recharges
4.) Repeat.

The point of whole thing is to NOT FLY ABOVE THE MAP. If you're flying outside of the map borders the mobs WON'T TRIGGER and they won't attack you.

First, focus the giant flying "boss" ships as they will keep spawning new enemis. No worries about hitting them with your head, they got no hitbox and won't deal you any dmg. After that focus giant wurms (they also keep spawning new enemies). Use your sniper rifle to kill remaining drones. If some enemies are stuck under the ground just fly above the map to activate them and wait untill they crawl out.

To reach wave 50 you gonna need 1-2 hours.

If you still need some help, there is a video:

Thank you for reading my guide. I hope it's gonna be helpful.
If you still got some questions feel free to ask in comments.