Maximum Blob 25G
Blob and Pinky completely upgraded

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I would recommend doing this after you have completed the game the first time. Just run through it without doing any upgrades first, to save having to do a second playthrough. See Keepin it real for more information. Once you have that achievement out of the way, you can buy the upgrades to help out while you are replaying the levels picking up anything you may have missed or skipped.

You can purchase upgrades with the lightbulbs you collect throughout the game. If you are playing on Normal, you will need EVERY lightbulb in the game to accomplish this and there are 480 total. The upgrade store can be found on the main menu under Upgrades and in the game itself. The stores found in the levels are denoted by a blue question mark.

Here are a list of upgrades and their cost:

• Increase Blobs starting lives to 2 5 bulbs
  
• Increase Blobs starting lives to 3 15 bulbs
  
• Increase Blobs starting lives to 4 30 bulbs
  
• Increase Blobs starting lives to 5 50 bulbs
  
• Increase maximum size to 120 10 bulbs
  
• Increase maximum size to 140 20 bulbs
  
• Increase maximum size to 160 30 bulbs
  
• Increase maximum size to 180 40 bulbs
  
• Increase maximum size to 200 50 bulbs
  
• Increase Player 2s ammo to 100 5 bulbs
  
• Increase Player 2s ammo to 150 10 bulbs
  
• Increase Player 2s ammo to 200 25 bulbs
  
• Increase maximum armor to 2 10 bulbs
  
• Increase maximum armor to 3 20 bulbs
  
• Increase maximum armor to 4 30 bulbs
  
• Increase maximum armor to 5 40 bulbs
  
• Damage charge cost to 60 10 bulbs
  
• Damage charge cost to 40 30 bulbs
  
• Damage charge cost to 20 50 bulbs

If you play the game on Easy, your reserves of lives will be completely maxed out from the start. That means you will not need to spend any lightbulbs in that category. So to get this achievement on Easy, you only need 380 bulbs instead of ALL of them. That allows you to skip 100 bulbs if you wish. You will still need all 480 for "Totally Inspired" though.