I just retype here what "BODOtheBoomerShooter" typed in German:
In that speedrun you can see all the Passwords after a level is complete. All you need to do is enter the password for the last level (Skyway) which is (YRVX3DEZRMNXMCLE), just beat the level Skyway by killing all spiders until the Exit opens up and you get the Achievement!

I want to add one thing, the spiders where pretty hard to kill using the Rocket Launcher, since they run away quite a bit. Because that password starts with zero Pulse Rifle ammo I used my Jet Pack to fly up right at the start, on top is one of those Energy Generators where I waited to get full 200 Energy and then used the Pulse Rifle on the Spiders. Was enough Time for the Achievement.

Im Speedrun sind alle Passwörter nach Levelende zu sehen. Danke dafür! Man muss das Passwort (YRVX3DEZ-RMNXMCLE) des letzten Level (Skyway) eingeben, danach durchspielen und man hat den Erfolg.

Was using this as a general guide cause man this game just lacks level design. period. this was SUPER helpful with more of the puzzle-like levels

Very helpful. Finally did it with some practice at around 19:42.

Well done! This is really an amazing speedrun.

This is so awesome to watch. Very good job on speedrun.