Hard Achievements The Easy Way

Paste into the console these lines:
*sv_cheats must be 0 at the time of the achievements (but can be 1 before)*

• Pressing keypad 2 will give you weapons and your suit
  
• Pressing X will give you ammo and health
  
• You have to give yourself ammo before the weapon runs out

Send the Hidden Hat to Xen.
run commands
*You have to look at the hat for the third command to work!*
Complete the level with the hat and you will get the achievement

Tips:
If you get stuck after going through a portal try crouching or shooting the hat with your gluon gun

Carry the Hidden Hat to Endgame.
run commands
*You have to look at the hat for the third command to work!*
Complete the levels with the hat and you will get the achievement
The boss fight should be easy with infinite ammo and health

Tips:

• If you get stuck after going through a portal try crouching or shooting the hat with your gluon gun
  
• You can skip part of the final fight by placing satchel charges on all three of the yellow crystals to blow them all up at once

View the *other* secret ending.
run commands
*You have to look at the box for the third command to work!*
Complete the levels with the box and you will get the achievement
The boss fight should be easy with infinite ammo and health

Tips:

• If you get stuck after going through a portal try crouching or shooting the box with your gluon gun
  
• You can skip part of the final fight by placing satchel charges on all three of the yellow crystals to blow them all up at once

Kill all Protozoans in the Borderworld.
Teleport to these maps in this order and kill every Protozoan to get the achievement.
With this command you can teleport a Protozoan to you by pressing "J"
map bm_c4a1a

• Kill 5 Protozoans

map bm_c4a1b

• Kill 12 Protozoans

map bm_c4a1b1

• Kill 10 Protozoans

map bm_c4a1c

• Kill 8 Protozoans

map bm_c4a1c1

• Kill 2 Protozoans

map bm_c4a2b

• Kill 14 Protozoans

map bm_c4a2c

• Kill 8 Protozoans

map bm_c4a3d1

• Kill 5 Protozoans

*Sometimes they will appear invisible, but you can still kill them or teleport them again!*

Find each member of the missing research teams.
There are 7 bodies in Gonarch's Lair you need to find and press "E" on:
*You can track your progress under esc > achievements*

1. After crossing the ravine you will get to a small cave with a scanner and a bullsquid. To the left are some orange crystals:
   
   
2. In the circular room with the explosives:
   
   
3. Next to the detonator:
   
   
4. Can't miss him:
   
   
   map bm_c4a2c
5. In the small opening which gets uncovered by the Goarch's approaching:
   
   
6. When you slide down and the Gonarch breaks through the wall across from you go to the left. Be fast or the room will burn:
   
   
   bind "V" "sv_cheats 1;noclip;sv_cheats 0"
7. In the last arena fly up onto the platforms on the left using "V". He is impaled on the thorns:
   

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
When you load in turn around and run downstream, after the map change turn around again and run back upstream
Now just complete the level

If you get stuck pathfinding try to follow the lights, they will guide you, or look for jump pads.
After you have passed a total of 12 Gargantuas and jumped across to the waterfalls you'll get the achievement
*Exploding Houndeyes will still explode! Be careful*

Complete Interloper without taking any laser damage.
It's pretty easy to get this:
Now Just use V to skip the first maps of Interloper as shown below. After that complete the last level semi-normaly:
*Be careful not to fly through the Lasers!*

Troubleshooting below

Map-ends:
Map 1:

• Fly towards the black pillar

Map 2:

• Into the small cave

Map 3:

• Into the middle cave

Map 4:

• In the small vent

Map 5:

• Fly into the circular room and walk into the left room

Map 6:

• Complete the level as you would in a normal playthrough until you come to this part:
  
• Now fly up the inside of the vent:
  
• Destroy all 3 of these on all 3 levels:
  
• Jump down the vent and complete the last part as intended. After flying up the large hole with the many jump pads you will get the achievement.

Troubleshooting:
If you have problems getting the achievement try this:

• Don't save/load. If you hit a laser quit the game and click resume
  
• Play the Release version 1.0 properties->beta->1.0
  
• Reinstall the game
  
• use the command "achievement_reset bms_laser_immunization" *Warning: this will reset you achievement progress*
  
• If that doesn't work try it without using cheats (only use "map bm_c4a3b")

Run commands
*You have to look at the canister for the third command to work!*
Fly to the control room over the arena using noclip, don't forget to take the canister with you. Now place it into the socket (Don't activate it yet!) and save, you can load the save for the other achievement. The Plan
Use Cyanogen to kill Gonarch.
Activate the gas and complete the level by jumping over the platforms. Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live.
Don't activate the gas and complete the level by jumping over the platforms.

Late for Work
Defeat the Nihilanth in under 4 minutes. Specimen GG
Take out all three Healing Crystals in Nihilanth's Chamber at the same time.

Start Chapter 18 from the main menu.
After you fall down, the first thing to do is place one satchel charge each on the three round hatches.

Start the fight as usual by shooting at the three blue crystals, using the Gluon Gun, until they explode. Don't forget to fill up your ammo - use your key bind to fill up the ammo before it runs out!

Once the yellow crystals come out, as seen by the beams, detonate the satchels. At this point you should get the achievement Specimen GG.

If there still are some crystals left, you can now either restart to get Specimen GG or you can proceed by blowing up the leftover crystals using your rockets.

Now just go back to shooting at the Nihilanth with your Gluon Gun - again, don't forget to fill up your ammo using said key bind - once he opens up his head just wait until he turns around, you should have more than enough time left. As his final head crystal explodes, Late for work should pop up.