This life goal "Serious Shredder" is easy to complete since this is only an interaction that you can unlock by stepping up to this hobby. You need to be at least Hobby Level 4. With just 2 Energy points and 1 Hygiene point, you can initiate and accomplish this life goal.
Life Goal
Serious Shredder
Description
"Show off rocking skills" in the Guitar Hobby.
Rewards
SimCash, Simoleons, Hobby Token, Gold Sack
1. Tap on your hobby object
Once you have all the requirements, tap your hobby object which is the "Beginner's Guitar to show all the available hobby events and interaction. Select the highlighted interaction "Show off rocking skills" to commence.
2. Strum your guitar like a Pro!
Your Sims will perform like a professional guitarist once you've picked out the interaction. This will last for 10 seconds. No need to hurry or to do anything aside from waiting.
3. Claim your rewards.
A gold check mark will appear beside your Sims' icon and on the top of your Sims indicating that the life goal is completed. Tap on it to collect your rewards. You'll also receive XP and Hobby points from completing the interaction. Move on to your next life goal.