Game guide:Guitar Star

Guitar Star is a Guitar skill challenge.

''Guitar Stars must play at 10 Parties and Venues in the town to earn their title. Afterwards, they earn larger monetary rewards for tips and performances!''

What this means
This may be one of the hardest challenge to complete as the description is very misleading. The player can not become a Guitar Star just by having 10 house parties with friends and playing the guitar there. Instead the player must succeed at 10 guitar skill opportunities. Music career opportunities do not count. The hardest part is getting guitar skill opportunity cards.
 * Any guitar opportunity counts including the ones were the sim does not perform, such as orginizing music sheets.

How to achieve Guitar Star
It is recommended that the Sim doesn't have any job (including Music career) or any other skill (not even basic cooking skill. Eat Quick Meal or pizza). Just play guitar for tips on the park and street day and night, day after day. Then, the opportunity cards will come. It takes about 6 Sim weeks.

Force Opportunities
I have come up with an easy way to obtain the Guitar Star achievement although it will require the use of cheats. This is how you will be able to get the Achievement:

Tested and confirmed. This tester was only able to get the useful opportunities while working at the Bistro, not the Diner. This may be unique to my game, but if it doesn't work for you, try transferring your employment to the other restaurant in town.
 * 1) Be employed in the Culinary Career (doesn't matter which job you have).
 * 2) Max out your guitar skill.
 * 3) Type in "testingcheatsenabled true" in the cheat bar.
 * 4) Shift-Click on your workplace (the diner).
 * 5) Click "Force Opportunity".
 * 6) Cancel any opportunities until you receive one that mentions playing the Guitar.
 * 7) Fulfil the conditions of the opportunity.
 * 8) Repeat 4-7 times until you get the achievement.

Disclaimer
This has been tested and proven by players so enjoy, and if you fail due to the opportunity time limit, try again and eventually, you'll get it.