Note: This can only be done while playing as Michael. The Epsilon quest line is the most time consuming in GTA V. It becomes available as soon as you unlock Michael as a playable character. Follow the step-by-step walkthrough below to learn how to trigger the missions. You will also need to have at least $90,500 with Michael. Certain donations have to be made, and an expensive outfit has to be bought. However, completing all of "The Truth" Epsilon missions can earn you up to $2,100,000. In the last quest, you have the opportunity to earn $2.1 million and a gold medal. If you are specifically looking for the five Epsilon vehicle locations (as these are the hardest part of the quest line), go to 2:31 in the video below. All of these vehicles have fixed spawn points. They will spawn at the shown points every time.
Step 1: Open the internet browser on your in-game cell phone, go to the Epsilon website at "epsilonprogram.com", and complete the evaluation.
Step 2: Once a question mark appears in Raton Canyon after a while, go there.
Step 3: After the cutscene, you will get an e-mail. Open the attached link, and donate $500 to the Epsilon website.
Step 4: The Epsilon symbol will appear on the world map after some time. Go back to your house, and save the game a couple of times until the symbol shows up on the world map. Then, go there.
Step 5: After the cutscene, you will get an e-mail. Open the attached link, and donate $5,000 to the Epsilon website.
Step 6: Go to the next Epsilon symbol. It may take some time until it appears on your map. Thus, keep going to sleep at your house until it appears.
Step 7-1: Collect all five Epsilon vehicles (1. Declasse Tornado).
Step 7-2: Collect all five Epsilon vehicles (2. Pegassi Vacca).
Step 7-3: Collect all five Epsilon vehicles (3. Benefactor Surano).
Step 7-4: Collect all five Epsilon vehicles (4. Enus Super Diamond).
Step 7-5: Collect all five Epsilon vehicles (5. Dinka Double-T).
Step 8: Go to the next Epsilon symbol. It may take some time until it appears on your map. Thus, keep going to sleep at your house until it appears.
Step 9: Successfully complete the mission.
Step 10: Donate $10,000 to the Epsilon website.
Step 11: Go to the next Epsilon symbol. It may take some time until it appears on your map. Thus, keep going to sleep at your house until it appears.
Step 12: After the cutscene, you will get another e-mail. Open the attached link, and buy the robes for $25,000 from the Epsilon website.
Step 13: After the robes are delivered (takes one day), get them from Michaels closet. You need to wear them for 10 cumulative days. Keep going to sleep until 10 days have passed.
Step 14: After wearing the robes for 10 days, go to the next Epsilon symbol. It may take some time until it appears on your map. Thus, keep going to sleep at your house until it appears.
Step 15: Successfully complete the mission.
Step 16: Go to the next Epsilon symbol. It may take some time until it appears on your map. Thus, keep going to sleep at your house until it appears.
Step 17: Wander five miles through the desert wearing the Epsilon robes. After that, you will get a call. Answer it.
Step 18: Go to the final Epsilon symbol. It may take some time until it appears on your map. Thus, keep going to sleep at your house until it appears.
Step 19: Successfully complete the mission. To get $2,100,000 and a gold medal, you must kill everyone and escape with your vehicle.