(AVCHD is a compressed format which does not play well or at all in FCP. Any which way, you will have to convert it into an editable format)
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What Apple says about AVCHD
You can transfer AVCHD footage to your scratch disk using the Log and Transfer window in Final Cut Pro. The workflow for transferring AVCHD footage from a camcorder or disk is similar to the Panasonic P2 workflow. However, there are some important differences:
AVCHD support is available only on Intel-based Macintosh computers.
AVCHD camcorders typically connect to computers via USB 2.0, not FireWire.
DVD-based AVCHD camcorders are not currently supported in Mac OS X.
Standard definition video recorded with AVCHD camcorders cannot be accessed in the Log and Transfer window.
Preview of AVCHD video in the Log and Transfer window is limited to 1x forward playback. Scrubbing the playhead does not update the video in the Preview area until you stop scrubbing.
AVCHD footage is transcoded to the Apple ProRes 422 codec or the Apple Intermediate Codec. You can choose the destination codec in the Log and Transfer window preferences.
When you choose to transfer AVCHD audio in the Logging area, audio is automatically mixed down to stereo.
It is not possible to delete clips on an AVCHD volume, even if read-and-write permissions on the volume are set to allow file deletion. This behavior is different on P2 volumes, where clip deletion is allowed when proper read-and-write permissions are set.
AVCHD files are transferred as entire files from beginning to end. It is not possible to set In and Out points before transferring the clips.