Here is the full list of all 14 64.0 achievements.
The base game contains 10 achievements, and there are 2 DLC packs containing 4 achievements.
Complete 64.5 level
Get a score of A+ in all the levels, from 64.1 to 64.5
Complete 64.4 level
Complete 64.2 level
Complete 64.3 level
Survive 64.0 seconds or more in the endless level
Complete one custom level
Complete 64.1 level
Play one custom level
Retry one level 64 times in a row
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Complete the Polkka level
Complete the Superpower level
Complete Mind Twister level