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There are 3 challenges for the handiness skill. The Handy trait will help to complete these challenges faster.

ElectricianEdit

Electricians have repaired at least 10 electrical objects. The experience gained means they will never be electrocuted by an electrical object again.

How to unlock: Repair 10 broken electrical objects. This will be harder if your sim has the unlucky trait, as they are more likely to fail at repairs.

PlumberEdit

Plumbers have repaired at least 10 plumbing objects. They are so good at repairs that plumbing objects repaired by them never break again.

How to unlock: Repair 10 broken plumbing objects. If you have unlucky trait it will help you to break the plumbing object faster so you can repair it.

TinkererEdit

Tinkerers have finished at least 10 unique upgrades on household items. Installing the "Unbreakable" upgrade on multiple objects only counts as one unique upgrade, so it helps to experiment with different upgrade options! Tinkerers never fail when upgrading objects.

How to unlock: Upgrade 10 objects. You must have at least lv7 in handiness to be able to upgrade most of the objects. Applying the same upgrade on multiple objects, e.g. installing fireproof on a stove and a fireplace, will only count as one unique upgrade