sorry I can't provide the German names but I've got an US version (and I'm glad I have).
+ the thieves guild is obtained from Renal Bloodscalp (second level of Shadow thief HQ)
+ I forgot Nalia's abduction (after her fathers funeral if you have her in party) in my list before
+ and of course the tomb of king strom (Samia in Firkraag's dungeon)
+ Harper trouble starts with a random encounter of Renfeld a man poisoned by bandits and continues on to the rescue (actually not) of Montaron. It is extended if you have Jaheira in party and are romancing her.
- the stronghold quests are obtained from
+ Nalia after doing the Keep for Fighter, Barbarian or Monk
+ Raelis Shai after doing the Planar Prison for Bards
+ Lavok after doing the Planar Sphere for Mages and Sorcerers
+ the Mayor after doing the Shadow Temple for Rangers
+ Renal Bloodscalp after doing the Thieves Guild for Thieves
+ from the Order of the Radiant Heart for Paladins
+ after doing the Druid Grove/Animal trouble for Druids
+ at the respective temple for Clerics
- unfinished quests are
+ the sewer Illithids
+ the Guarded compound (temple district) which is connected to
+ the Twisted Rune (Bridge district)
- some minor encounters are
+ Neeber in Imnesvale
+ the fake Dragonslayer Wilfred the Red in Trademeet
- some major violent encounters are
+ Mencar Pebblecrusher and his party in the Den of the Seven Vales (Waukeen's Promenade
+ the Sewer gang
+ Cowled Wizards if you cast spells in oublic too often (i.e. twice)
There may still be some left I forgot but we will get them in time
