Suit Upgrades & Schematics
Maximizing your Rig and weapons in Dead Space Remake requires collecting Power Nodes and Schematics. The Level 6 Suit is exclusive to New Game Plus. You will need 189 Power Nodes for all upgrades, but only 76 can be found in a single playthrough. Purchase additional Power Nodes from the Store for 10,000 Credits each, prioritizing them with spare Credits after buying Med Packs and Ammo.
The long haul of this 100% completion will be maxing out all 7 Weapons and your Rig, as well as the Level 6 Suit which is only available on NG+. Throughout the game, you can collect and receive Power Nodes which are used to Upgrade your gear. It will require 189 Power Nodes to purchase all of the Upgrades, but only 76 Power Nodes can be physically collected in a playthrough. A lot of your Credits will be tied up in buying Upgrades, Med Packs, and Ammo for your first playthrough; any you have to spare will go towards Power Nodes. Across two full playthroughs, you should have more than enough Power Nodes for the Maxed Out Achievement.
Hold off on trying to buy new Weapon Upgrades until you purchase the Suit. It will cost 20,000 Credits to purchase. With a Gold Semiconductor and another found using Level 2 Security Clearance in the Bridge Hall Storage Room, you can gain at least an extra 6000 Credits. Once there are no more Weapon Upgrades to purchase, focus on using Credits to buy Power Nodes, but remember that several expensive Suits still need to be purchased.