I got all achievements in payday 2 (well there is a few I don't have but those are impossible to get right now because they are teaser achievements but shush man yesterday I had 100%). It took me about 800 hours to do which i'd say is relatively quick in comparison to other people who have perfected the game.

I did this in 3 sections (in this chronological order):
1) All DSOD's - Took about 150 hours (Very quick)
2) Infamy 100 *1 ♥♥♥♥♥♥♥ achievement* - Took about 350 hours (Average - leaning towards the slow side)
3) The rest of the achievements - Took about 300 hours (Very slow)

Get infamy 1 level 100 first, then the grind begins. (I went to infamy 3-100 but the effect is the same)
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2490027247
These are my DSOD builds for essentially all gamemodes in payday, so refer yourself to them. For beginners to DSOD I recommend the fire crit builds (kingpin or anarchist). Legacy edition (7 pounds/10 dollars should cover most of the builds).

Stealth is very simple, I recommend watching Marcmb for stealth/ecm rush tips. https://www.youtube.com/user/Marcmb365

Loud is a bit more complicated, I shall refer you to kevkild's DSOD loud guide:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2269730558

I also recommend watching Carrot,Uncle Geldgiel and Yokai for DSOD Loud content and other builds.

the TLDR is tho:
- Get kills
- Have good builds
- Do objectives in the assault phase fade - https://www.youtube.com/watch?v=owVI6wz7590

For Lab rats/Goat sim you may want to queue public and find a carry, I didn't need one for either but thats after 5hrs of lab rats and 12hrs of goat sim *Straight*... those were 2 not very good days.

Feel free to friend me if you have any questions regarding anything to do with DSOD Loud as it is possibly my favourite mode in payday and am in T$D (Kinda decent loud clan with youtubers and stuff)

Welcome to the world of infamy grinding, the worst, most boring thing in payday 2 (with a surprisingly chill community surrounding it... like me :))

I recommend joining marcmb's steam group chat - https://s.team/chat/S2ELrTHA... and watching his youtube videos https://www.youtube.com/user/Marcmb365 for ecm rushing more complex maps like big bank as you may want to do that sometimes for a funner experience.

The main strategy is called Diamond Store Spam. It is almost* the best infamy grinding method in the game and by far the most accessible to new players. Diamond store spam consists of repeatedly ecm rushing diamond store *thousands of times*. No lie check my fbi files - http://fbi.overkillsoftware.com/suspect/76561198159894157

I will refer you to my ultimate guide to this ECM rush - https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2434560819

The TLDR for the guide is tho:
Place ECMs in lobby order (Green>Blue>Red>Yellow)
Have one player kill the security guy and say 's' in chat if the alarm box is there
Have one player kill the manager and put the keycard into the alarm box.
Loot up!

Feel free to friend me if you have any questions regarding anything to do with this section as I am still very active in the ECM rush community!

Not much to say in this section so ill just put it in bullet points:
- You will have to buy a few DLC's
- Achievements like tabula rasa and We do it live! can be done with 1 player and 3 bots running any weapon. Just let them carry you.
- https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2476143339
-Long grind, very unfun. The final stretch.

now your empty inside from all the grinding and cant enjoy the game anymore...

jk play loud its fun I promise.