The Epsilon Missions are a series of quests in the Strangers and Freaks line of missions in GTA 5. They are unlocked after the Father/Son and Pulling Favors missions have been completed.
This is a pretty annoying and tedious mission line, and will cost you a pretty penny, but near the end you’ll have the chance to make it all worth it.
GTA 5 Kifflom!
Choose Michael and open up the browser on your phone. Head to the search bar and type in ‘Epsilon’, then hit the search button.
Open up the first link you find to get to the Epsilon website, where you’ll have to complete the Epsilon Program Identity Evaluation. After completing this, you’ll see a new question mark on the map, denoting a new Strangers and Freaks contact.
For the first mission you just need to go to the location, watch the cutscene and pay someone $500. That’s all.
Do so by visiting the Epsilon website. The next mission is pretty much the same, go to a marker, watch something happen, then make a donation, this time of $5000.
For the third mission, you’re given the task of acquiring 5 very expensive cars for the Epsilon order. These can be difficult to obtain, although you can buy them online of you’ve got the money. If you don’t then you’ll have to do it the old fashioned way.
The Super Diamond, Tornado and Dinka Double-T motorbike will spawn more frequently for the duration of this mission. You can find the Surano parked in a cul-de-sac near Lake Vinewood.
You can look for a Vacca parked in front of a house in the Vinewood Hills.
For the fourth mission, you need to meet up with Marnie and follow her instructions.
You’ll be wandering around the area with an alien detector, looking for artifacts. After you find it, she’ll tell you to make a $10,000 donation to unlock the next step. Head to the website and make two 5000 dollar donations.
At the next Epsilon location, you’ll find Marnie at a Graffiti wall near Downtown Vinewood. You’ll be told to purchase some clothes from the Epsilon website and wear them for a total of 10 consecutive days. Do so.
In the next Epsilon mission, Jimmy will tell you to transport an airplane to another location. Land at the correct airfield (I’m assuming you know how to fly at this point). And talk to Jimmy again to finish off the mission.
At the next mission, you’ll be given the task of running 5 miles in the desert. A simple task, however, you’ll be asked to make some very hefty donations later.
Now it’ll be time for the final mission. Make sure to have $50,000 in pocket, and head to the marker.
You’ll make another donation, then be tasked with moving the Epsilon money van to another location where there is a helicopter waiting. Get to the location, but instead of just handing off the money, kill everyone there.
After the helicopter crew, security team, and backup security are dead, you can make off with the money to get this achievement.