[Download + Tutorials + Discord] MEAExplorerWV - Unofficial ME:A Modding Toolkit

While the game is running, open Cheat Engine (run as admin, also run the game as admin).

Select ME:A from the processes list.

Stand next to a vendor - this part is important.

Look at your credit balance. Let's say you have 10,000 credits. In Cheat Engine, put 10000 in the Value box on the right and hit "First Scan." 

Tab back into the game and buy something small, like a consumable. Look at your new credit balance, which is now, perhaps, 9,750.

Tab back out and put 9750 in the Value box and hit "Next Scan."

See how the 'addresses' and values in the left hand box change and how there are now fewer of them.

You probably need to go through the same "Next Scan" steps a couple more times, until you're left with maybe 4 or 5 values on the left hand side of Cheat Engine. Those values are what controls the level of credits you have.

Click on each of those lines individually. It'll bring them up in the box at the bottom. Click on the number in the column that says "Value" and change it to whatever you want. Do this for each of the lines.

Tab back into game. Close the vendor screen. Open the vendor screen or your inventory - you'll see you now have however many credits you gave yourself.

You can do the same for materials and research, but you'll have to do it in a slightly different way. Instead of using a vendor to change the values, you'll have to use the research screen for research - type in the value of research you already have for "First Scan" then research something, and type the new value for "Next Scan" and keep going researching more things until you isolate the value(s) for research. For materials, you can do it either in the development screen or more easily at a vendor by selling a few of your resources to update the values for Next Scan.

You can theoretically do it for augments as well, but you'll need at least 3 or 4 of them in your inventory to begin with so that you have enough to sell one at a time and do Next Scan enough for it to isolate the appropriate address. I used to do this for the rare potion and crafting materials in DA:I because who has the time to search for enough Black Lotus, right?

What it's doing is trying to isolate the addresses in the game for a particular item. Lots of things will have the same numbers associated with them, so you need to tell Cheat Engine to look for the numbers that change from X to Y to Z. When you've done that, you have what you need and can change it.