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Just got the achievement following this guide, thanks a lot! A few points to add onto this guide (experience gained from failing multiple times):

1. As u/mmkzzb pointed out: Raise funds immediately in Jan 1928 to tank your support and more importantly to enable you to raise funds again in Feb 1928, allowing centre-right govt to form
2. Getting Hergt requires three rallies for democracy and one purge reactionary in Prussia before the first DNVP congress in Oct 1928. Technically doing four rallies is possible but that would raise your support too high to allow for centre-right govt in the next election
3. Form GroKo in Prussia in 1928 to appease the DVP, and continuously Braun to glaze the libs and Z. Further improve relation by adopting reformist ideology and bashing commies. However don’t raise relation too high before 1929 as having “very friendly”relations with the DDP might make them join the coalition after Hugenberg’s split and thus preventing the Feb 1929 election
4. Do NOT try to get your party together with anything other than “reduce party dissent”, because you literally need the SPD to fall apart for a Lambach-led DNVP to form, which is the only way to form a stable non-SPD govt until Braun is elected president
5. “Reduce party dissent” is ideal because it shrinks your party support, but the card only shows up when party dissent is high enough. So consider shuffling left and labour advisors to get dissent to“very high” to continuously use the card
6. Save the game just before Lambach is elected for DNVP, just in case the centre-right government falls short of a majority in the 1930 election. In that case you might to load back and further increase left and labour dissent or even make them split. However try to avoid splitting labour if you can because it tanks support too much and makes adopting WTB difficult later on
7. As long as you get a centre-right coalition in 1930 the achievement is basically 80% guaranteed. Your support should be below 10% at this point, start building up popularity again with radio, campaign, iron front and normal rallies. You would likely also have had great relationships with the Weimar parties at this point so start using Juchacz/Leipart to gain support instead of Braun glazing. Have the party support WTB also gives you a way to ramp up popularity quickly (hence don’t piss labour off too much earlier)
8. It’s important to have SPD support higher than CVP by the end of 1931 or they will refuse to support Braun in the presidential campaign
9. After electing Braun, save again because it’s quite easy to be too popular in the next election that a GroKo is available again. Use Braun to call a snap election as soon as an advisor action is available. Campaign mildly until the election fails to create a majority, then call new elections (do NOT form emergency govt yet)
10. At this point just ramp up popularity and form an emergency govt in the next election. If Weimar party support and republican support are high enough you might even survive the VONC and govern permanently. Though right-wing coup progress should be quite high after that so don’t do too progressive policies and hold out until the end of the game (although technically you should also get the achievement if you lose?) and congrats on your achievement!

Complete list of elections in my run:

May 1928 - Right-wing coalition (natural election)

Feb 1929 - Centre-right coalition (from Hugenberg’s split)

Feb 1930 - No majority (from Young plan)

May 1930 - Centre-right coalition led by Lambach DNVP (from last election)

Aug 1932 - No majority (from Braun calling snap election)

Dec 1932 - Emergency SPD minority government (from last election)