FULL SPEEDRUN FOR REFERENCE
Honestly, follow this speedrun. I was having so much trouble cause the balance of the game was so out of wack and the turret sections were pretty rough. This player shows some ways to work around the parts that are horrible.
TIPS/BUGS TO MAKE THINGS EASIER
Here are some good buggy things you can do to make it easier and faster.
I just followed these videos and got all DLC and base game achievements in 17 hours. Honestly, the hardest part for me was air hockey due to me being at 90 FOV and being confused as to why I couldn't hit it make sure to lower with this achievement btw. My biggest personal tip is to be careful with explosives, especially the remote detonator it's a shootable object by enemies and they seem to hit it a lot the second you throw it.
BUG WARNING.
On Mission Ghost Town there is a jump with the monster truck that is almost impossible without V-Sync on. There are other weird bugs in the game where with V-Sync off it can cause major issues. I suggest having V-sync on the entire time it fixed all the issues I had with the game with certain checkpoints not procing or on level 6 when the crane operator drops the dumpster for some reason it would never move unless I had V-sync on.