I think you mean a deponent verb?
I think a defective verb is one which is missing other parts, e.g. πρέπει which has no other persons or δει, έδει (as in όπερ έδει δείξαι) which also has only a handful of forms.
But "has only passive forms [with active meaning]" is "deponent", I think - it has "put away" (de-posed) its active forms.
What are all the endings for deponent verbs?
Same as for passive forms of normal verbs.
See e.g. the table at https://en.wikipedia.org/wiki/Modern_Greek_grammar#Grammatical_voice .
εμπιστεύομαι goes like γράφομαι -- this category is probably the largest.