display text value of a positiveintegerfield

I am a newbie. I have searched the django docs for this answer, but I failed to find a reference, so here is my question.

I have a select list as part of a form stored in my models.py file as a positiveintegerfield, as shown below:

    

class AchievementDetails(models.Model, FillableModelWithLanguageVersion):

    SELECT_ACHIEVEMENT_TYPE = 0

    ACADEMIC_ACHIEVEMENT = 1

    COMMERCIAL_ACHIEVEMENT = 2

    PERSONAL_ACHIEVEMENT = 3

    PROFESSIONAL_ACHIEVEMENT = 4

    SPORTING_ACHIEVEMENT = 5

    OTHER_ACHIEVEMENT_TYPE = 6

    ACHIEVEMENT_TYPES = (

        (SELECT_ACHIEVEMENT_TYPE, _('Select Type')),

        (ACADEMIC_ACHIEVEMENT, _('Academic Achievement')),

        (COMMERCIAL_ACHIEVEMENT, _('Commercial Achievement')),

        (PERSONAL_ACHIEVEMENT, _('Personal Achievement')),

        (PROFESSIONAL_ACHIEVEMENT, _('Professional Achievement')),

        (SPORTING_ACHIEVEMENT, _('Sporting Achievement')),

        (OTHER_ACHIEVEMENT_TYPE, _('Other Achievement Type'))

    )

    ....

    achievement_type = models.PositiveIntegerField(choices=ACHIEVEMENT_TYPES, default=SELECT_ACHIEVEMENT_TYPE, validators=[MinValueValidator(1)])
    ....

In one of my templates I would like to display the text value of the achievement_type, but I can only get the number value of the users saved selection to be displayed.

Here is my views code, that returns only the numerical value of the users saved selection:

def achievement_details(request):

    ....

    for ad in achievement_details:

             ad.achievement_type_as_text = ad.achievement_type 

    ....

How do I display the text value of the saved select list value?

For example if the user has saved 2 as the achievement_type, how do I display Academic Achievement and not the number 2.

I have tried the following line of code, but this only returns (2, )

ad.achievement_type_as_text = AchievementDetails.ACHIEVEMENT_TYPES[ad.achievement_type]

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