Question: On Earth, the presence of tides due to the Sun and Moon influence certain currents and other movements of water. This in turn leads to different forms of erosion, which can transform a landscape.

I'm working on a moon that's tidally locked to a planet - pretty much identical to the Earth-Moon system, except that the moon is slightly more massive, and has an atmosphere, water, and life (thanks in part to a magnetic field).

How will the tidal locking - meaning a lack of tides - influence the geography of this moon? Will erosion rates be different? Will that land be shaped differently?

Answer: 
I believe in this case [Sun Tides](http://hyperphysics.phy-astr.gsu.edu/hbase/tide.html) will become dominant.

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> Even though the Sun is 391 times as far away from the Earth as the Moon, its force on the Earth is about 175 times as large. Yet its tidal effect is smaller than that of the Moon because tides are caused by the difference in gravity field across the Earth. The Earth's diameter is such a small fraction of the Sun-Earth distance that the gravity field changes by only a factor of 1.00017 across the Earth. The actual force differential across the Earth is 0.00017 x 174.5 = 0.03 times the Moon's force, compared to 0.068 difference across the Earth for the Moon's force. **The actual tidal influence then is then 44% of that of the Moon.**
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So while tides will be much less than a non-tidally locked system, it's only by a factor of perhaps 2/3rds. That's enough to still leave significant tides, so I expect you won't see a significant difference in the factors you mention as important - geography, land shape, erosion.
I do not think tides have any considerable role in forming the landscape. An influence of storms and weather patterns in general is much stronger.

For example, consider Black Sea which had no visible tides for few last Mys. You cannot tell the difference from any other seashore in a similar climatic area.