How can I reopen a criminal case I took a plea bargain for in WA?

The court is not responsible for providing "all the details of" your choices. Pursuant to the rules of criminal procedure, it must advise you of the rights you give up in entering a plea (the right to trial, to confront witnesses, etc..) and the written plea forms caution a defendant that (s)he may end up being placed on probation in a misdemeanor case for two to five years. There are other warnings, depending on the charge, pertaining to the ability to carry a firearm and so on. If you executed such a form and you were orally questioned by the court and advised that you understood what you were doing, chances are you would not be able to undo the damage. Add to this the fact that you are well beyond a year's time for collateral attack and it appears you have no choice with respect to "reopening" the case. You may, however, be able to expunge the conviction, but should consult with an attorney who handles such post-conviction motions.