List options without typing on autocomplete
A possible solution is to show the field as a select list and then use the chosen module to get the functionality of searching through the options.

From the module's description:


  You can force enable/disable Chosen for certain field widgets: Select list (for both list and date fields), and Select (or other) list. If you have a field using one of these widgets, in the field settings, you will find a Apply Chosen to the select fields in this widget? option with three values: Apply, Do not apply, or No preference (which will fall back to using the automatic application).