There are several ways to gain blindsight in DnD 5e:
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Blind Fighting (Fighting Style). 10-foot radius. Available to Fighters, Paladins, Rangers, and any character who takes the Fighting Initiate feat.
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Wild Shape (2nd-level Druid feature). Radius depends on the beast, but many beasts that a Druid can transform into have blindsight.
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Pact of the Chain (3rd-level Warlock feature). 10-foot radius. Chainlocks can summon a pseudodragon with Find Familiar, and see through its senses.
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Blindsense (14th-level Rogue feature). 10-foot radius. Technically, this isn’t blindsight, but it accomplishes the same thing.
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Feral Senses (18th-level Ranger feature). 30-foot radius. Technically, this isn’t blindsight, but it is basically the same. However, if you are blinded or deafened, or a creature is hidden from you, Feral Senses doesn’t function.
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Find Familiar (1st-level spell). 60-foot radius. If you choose the bat familiar, and it is within 100 feet of you, you can use an action to see and hear what it does, with the benefits of its special senses (blindsight).
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Polymorph (4th-level spell). Radius depends on the beast, but many beasts have blindsight.
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Draconic Transformation (7th-level spell). 30-foot radius. This spell is from Fizban’s, so some tables might not use it.
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Shapechange (7th-level spell). Radius depends on the creature, but many creatures have blindsight.
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True Polymorph (9th-level spell). Radius depends on the creature, but many creatures have blindsight.
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Dagger of Blindsight (magic item). 30-foot radius. This is a rare item, found in Waterdeep: Dungeon of the Mad Mage.
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Dragon Mask (magic item). 30-foot radius. There are many colors of dragon mask, but they all allow you to gain blindsight for 5 minutes once per day.
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Draconic Senses (Rare Draconic Gift). 10-foot radius. If a dragon likes you, they might bestow a gift upon you, including this one.
