Finish the game solo
Save as many parts as you can in the 1st system
Transport all your spare parts to the 3rd planet, Badooyne
Go back to the Main Menu
Create a new profile
Get to the 3rd planet, which is the 1st time you get access to the merchant
Go back to your 1st profile
Go to Badooyne
Create a Multiplayer Sale
Sale 1 part for 1 credit
Repeat 19 times
Go to 2nd profile
Go to Badooyne
Open the Merchant, go to Multiplayer Sales
You should see the 20 sales you created
Before you buy them, view the profile 1st
Send friend request to your self
Switch profiles again
Accept request
Send a gift to yourself, 1 credit or part
Send all spare parts to 2nd profile as a gift
Switch profiles again
Buy all sales
Open all gifts
Create a Multiplayer Contract
Select your 3 parts that you have the most of
Select destination, 2nd planet, Gaius
Repeat, create as many contracts as you can between the 2 planets
Switch profiles again, 1st profile
Accept all Multiplayer Contracts
Complete all Multiplayer Contracts
You will have to switch profiles multiple times to create new contracts
It is best to use 2nd profile to create contracts and 1st profile to complete them
Your 1st profile should have the the largest ship layout and the most ship components
This will make completing the contracts very fast and easy
Keep doing this until you have transported 50 materials for friend
Keep doing this until you have transported 500 materials for other players
This should get you all the Multiplayer Achievements
Achievements should unlock as you switch between profiles
You might also have to close and relaunch the game if they dont

We're gonna be rich!
Create a multiplayer sale

I need you!
Create a multiplayer contract

A real bargain!
Buy a multiplayer sale

Hard-nosed consumer
Buy 20 multiplayer sales

Business man
Have 20 multiplayer sales bought by other players

I'll do it for you!
Transport a material for another player (using player contracts)

Best buddy
Transport 50 materials for friends (using player contracts)

Independent CEO
Have 50 materials successfully transported by other players (using multiplayer contracts)

Fierce delivery man
Transport 500 materials for other players (using player contracts)