Does reach allow a creature to block flying creatures but not creatures with other evasion abilities?

Reach (CR 702.17) allows a creature without flying to block a creature with flying. Normally, a creature with flying can only be blocked by other creatures with flying or reach (CR 702.9b). Reach exists solely to interact with this flying restriction — nothing more.

Reach does not grant any ability to bypass other evasion restrictions. For example, a creature with shadow can only be blocked by other creatures with shadow (CR 702.27b). A creature with reach but no shadow still cannot block a shadow creature. Similarly, reach provides no help against creatures with fear, intimidate, skulk, menace, or landwalk.

Each evasion ability has its own specific blocking restriction defined in the rules, and reach only addresses the one written in the flying rule (CR 702.9b). Unless a rule explicitly says reach interacts with another ability, it does not.

Concrete example: Your opponent attacks with a 2/2 creature that has both flying and shadow. You control a 3/3 Spider with reach. Because your Spider has reach, it could block the flying part of the restriction — but the shadow ability independently requires the blocker to also have shadow. Since your Spider lacks shadow, it still cannot block that creature.

In short, reach is a narrow ability: it answers only the question of blocking flyers. All other evasion abilities remain unaffected by it.