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The ending can be done 1 up to 4 players but everyone needs to do some tasks before you start the White House
Golden Grin Casino
Brooklyn Bank (Overkill difficulty)
Breaking Feds
Henry's Rock
Shacklethorne Auction

After you did those heists enter your safe house and go to the 2nd floor to this table and pick up to medallion

then go to the kitchen and open these boxes



Then you need to assemble them on obsidian plate

After you assemble it it'll be spinning to stop that you need to go to Scarface's room "Room need to be upgraded to level 3" and play this melody on his piano

And after that go to kitchen and it'll be like this

After you did everything press on the artifact and you'll get something written on the strange language

You can translate them by this photo

There will be achievements if you translate them
You will get 20 achievements out of 57 and it'll be random always so you need to translate them and complete them
1- Jewelry Store Job - Diamonds are Forever
2- Any Bank Job - A Good Haul
3- Shadow Raid - I Will Pass Through Walls
4- GO Bank - All Eggs in One Basket
5- Diamond Store - Hostage Situation
6- Any Armored Transport - But Wait - There’s More
7- Train Heist - We’re Gonna Need a Bigger Boat
8- Mallcrasher - Self Checkout
9- Four Stores - Platinum Card (Or: "Yeah, He’s a Gold Digger”)
10- White Xmas - What’s in the Box?
11- Ukrainian Job - Let’s do th…
12- Meltdown - They Don’t Pay Us Enough
13- Aftershock - Bring It Back Safe
14- Nightclub - Let Them Boogie
15- Stealing XMas - The Grinch
16- Watchdogs - Out of bounds
17- Firestarter - Lord of War
18- Rats - Full Measure
19- Big Oil - Doctor Fantastic
20- Framing Frame - I Wasn’t Even There!
21- Election Day - I’m A Swinger
22- Big Bank - Don’t bring the Heat
23- Hotline Miami - Walk Faster
24- Hoxton Breakout - Watch The Power Switch!
25- Hoxton Revenge - Silent But Deadly
26- The Diamond - Cat Burglar
27- Golden Grin - High Roller
28- Bomb: Dockyard - I’ve got the Power
29- Bomb: Forest - Pump It Up
30- Scarface Mansion - Settling a Scar
31- The Alesso Heist - Sound of Silence
32- Counterfeit - Dr. Evil
33- First World Bank - OVERDRILL
34- Murky Station - The Pacifist
35- Boiling Point - Remember, No Russian
36- Goat Simulator - Hazzard County
37- Santa’s Workshop - Santa Slays Slackers
38- Car Shop - Gone in 240 seconds
39- Biker Heist - Full Throttle
40- Panic Room - Quick Draw
41- Brooklyn 10-10 - A Rendezvous With Destiny
42- Yacht Heist - Pacifish
43- Undercover - Not Even Once
44- Slaughterhouse - Making a Statement
45- Beneath the Mountain - Clean House
46- Birth of Sky - 1...2...3… JUMP!
47- Heat Street - It’s Nice To Be Nice
48- Green Bridge - Attacked Helicopter
49- Alaskan Deal - The Fuel Must Flow
50- Diamond Heist - Blood Diamond
51- Reservoir Dogs - Waste Not, Want Not
52- Brooklyn Bank Job - All the Gold in Brooklyn
53- Breakin’ Feds - Stalker
54- Henry’s Rock - Hack This!
55- Shacklethorne Auction - Press [F] to pay Respect
56- Hell’s Island - Beacon of.. nope
57- No Mercy - Keeping the Cool

You need to start this heist on overkill or above difficulty and do the default steps and when you're at the bunker go to the conference room and there will be a painting on the wall and if it shins it means every one done the secrets tasks correct

Take that painting of the wall and blow that wall and there will be a secret path and at the end, an elevator go on that and get down and get ready if you're with your friends 1 of you need to answer and translate other players need to cover him but all of the enemies will be cloaker's but they won't drop any ammo so have as many ammo bags as you can get.

Front-right lever moves the outside and middle rings.
Back-left lever moves the inside and middle rings.
Back-right lever moves the middle ring.
Front-left lever confirms your answer.
Translate and answers
1- I am the bearer of the greatest gifts, I give what you seek THE MOST.
Giant

2- That of the watcher which will be consuned in the voice of SUMER....
Zumru

3-With my companions wisdom and ferocity that which i fly over that is my LAND.
Sumer

4-I stand in front of the humble man on the wicked path as a COMPANION.
Sword

5-In the sand-covered lands of the pharaohs, I am followed by the missing LIGHT.
Sheut

6-I must face two to ascend, lest I meet my final journey in this CHALLENGE.
Chess

7-At the gates of silent memory, the lizard god speaks thy NUMBER.
Lahun

8-Among old recovered things, four couples are eternally locked in their LOVE.
Dance

9-Upon the terrace of riches and wealth, I hold what all who behold me DESIRE.
Jewel

10-In the temple of gold and white, I bind myself to my psyche FOREVER.
Cupid

11-The legacy of Alessandro Cagliostro calls to the eastern STAR.
Guide

12-I am trusted to guard the great wealth of the land, but do not trust my WORDS.
Apate

13-Twins exchange a breath, the third sibling is banished until it RETURNS.
Algol

If the answer is correct the golden corners will be pushed and if you have the wrong answer you need to start it from the beginning.

After you have all answer correct there will be light and you'll be unmasked and then you need to enter the vault and wait for the dentist to talk. once he talked he'll say to open the vault door. you need to open the door but be ready to kill the dentist "try to shot his head" once he is dead you need to go inside the vault with bain and place the Mayan gold.
After you did everything and place the gold you'll get secret ending.