Is the Acer Aspire C27 good for gaming?

No. It relies on integrated Intel graphics and a low-power Core 5 120U, so it handles everyday tasks but not modern games. Casual and older titles at low settings are the limit.

Can I upgrade the RAM or storage?

All-in-ones like this are harder to open than a tower, and Acer does not market it as user-upgradable. Buy the 32 GB and 1 TB configuration you need up front rather than planning to add parts later.

Does it have a touchscreen?

No, the 27-inch 1080p display is a standard non-touch panel.

Is 1080p sharp enough on a 27-inch screen?

It is usable, but pixel density is lower than on a 24-inch 1080p or a 27-inch 1440p display. If sharp text matters, compare it with a QHD all-in-one before buying.

What comes in the box?

Expect the all-in-one unit, a stand, a power adapter and basic documentation. A keyboard and mouse are not confirmed for this listing, so check before ordering if you need them.

When is the best time to buy it?

With only one store pricing it new, discounts are likely tied to that store's sales events such as Black Friday and back-to-school. Watch the price history rather than expecting cross-store competition.