Thalys-- Brugge to Amsterdam
 

All of the schedules say:

Brugge to Antwerpen
Berchem to Amsterdam

What is Berchem, is this a different train station in Antwerp? If so, how do I get there?

It should be:
Brugge to Antwerpen-Berchem
Antwerpen-Berchem to Amsterdam
Just a regular train change; no station change required.

We're doing that next month:
Brugge to Antwerpen-Berchem
IC 1809 [Lv 1003, Arr 1118]
Antwerpen-Berchem to Amsterdam
Thalys 9321 [Lv 1205, Arr 1406]

topping

Antwerp (Antwerpen) has two main train stations, Antwerp (sometimes called Antwerpen Centraal) and Antwerpen-Berchem. The Thalys stops only at Antwerpen-Berchem. Some local trains stop at both Antwerpen and Berchem, others only at Antwerpen.

As there are no special high-speed tracks yet between Antwerp and Amsterdam, the regular internation train takes almost the same time as the Thalys train and is a lot cheaper, just so you know!