Welfare reform? Partial birth abortion ban?
The nature of politics is that there aren't final victories or final defeats -- everything is up for grabs every minute -- and the nature of American politics on the national level is that it's hard to get much done at all.
And how many enduring conservative goals were achieved before 1988?
I'm not saying we were on the right track for the last 20 years, just that lasting policy changes in politics are rare in politics. If you're thinking you can change the direction the country's moving in if you just insist on it, you're going to be disappointed most of the time.
Heller decision on the Second Amendment, followed by the McDonald decision, to add to your list.
One thing that occurs to me is when measuring gains are we speaking in terms of seizing new ground or reclaiming old? The left has been able to boast of wins that are truly gaining new ground (phag marriage, pot legalization, expanded and federally funded abortion, etc) while our victories are all in reclaiming ground previously won by the left.
It makes their gains appear more substantial than ours.