Interfacing 2 accelerometers through I2C
Basic functionality of I2C allows multiple slave devices connected to and communicating with a master (or more than one master) device. Each slave device must have a different address. This can be a problem with some devices that allow only a limited selection of slave addresses or even a single, unchangable address. (There are work arounds with bus multiplexors and such.)

Summary: yes, you can probably put two accelerometers on a single bus, but it depends on the specific device selected.

I'd suggest that you do basic reading on I2C before proceeding with your project.