1) They can be found at:
C:\Users\user_name\AppData\Local\DH2\Saved\SaveGames

2) Download my files from:
https://drive.google.com/file/d/1Q1tYH0Bjopany8MT_kHk0J5SVJzv-lEt/view?usp=sharing

3) Disable Steam Cloud sync!

4.1) Replace "DevAutoSave_0.sav" and start the game.
IF that didn't work, then
4.2) Replace entire folder and make sure it's visible (not set to hidden).

You should spawn in Bay City, where I left everything to pick up:
last artifact, last audio, last poster, last odd mission and last toilet/human hive buildings + last gene upgrade.

Orange marks - poster & audio. Red marks the artifact. Green... DNA, but you don't really need it.
Pinks are toilet and hive building. Black is the last odd mission, complete it with all secondaries!

Gather the above and you will unlock these:

Arty Facts
Collect all Alien Artifacts




Gotta Catch All the Pop Art
Collect all posters




This Is Earth Radio
Collect all songs




Ultimate Smoothie
Unlock all Gene Blender upgrades




Toilet Break
Demolish a public toilet on each map




Hidden Human Hive Harvest
Use your saucer's weapons to scare human cattle out of their hidden hives on each map



Against All Odds
Complete all odd jobs




The Optional Mandate
Complete all optional mission objectives (use the Holopoxdeck if you have to)

Suggested route:
1) once loaded, instantly access your gene blender and complete the final mix:


2) Board the saucer and destroy these two facilities:




3) Fly to the north island and there pick up the artifact with DNA (if you want to):


4) Return to the central - take a poster (mission area) and the vinyl (hippie hangout):




5) At last, beat the final mission with all secondary objectives.

Yes, you can replay all missions and try to trigger story related achievements - IF - your own game got bugged and cannot proceed further, doesn't spawn next missions, etc-etc-etc.

Some time ago I made a similar saves share for DAH (2020).
Should you be interested, it's here:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2777037502