Hi. Does this come with a 20V Max battery and charger?

No. Model DCPW550P1 comes with the battery and charger.

Does this come with all accessories and battery plus charger or it’s just the tool?

There are two options for this tool. One that comes with a battery one that does not. Obviously, if it comes with the battery it will be more expensive. I purchased this tool and then returned it because I wasn’t happy with the results. It was very heavy and didn’t have the power I was hoping for

does this come with all the attachments?

The DCPW550B includes: (1) DCPW550 Power Cleaner (1) Long wand with quick connect (1) Turbo nozzle (1) 15° Nozzle (1) 25° Nozzle (1) 40° Nozzle (1) Soap bottle (1) Suction hose (1) Quick connect hose adaptor (1) Storage bag