The achievements “The Walking Dead” and “In the Name of Love” in the Cooperative Missions-> Kerrigan section are not counted.
For “In the Name of Love”, the progress of stunned enemies is not fully taken into account when using “Immobilizing Wave” in normal co-op mode.
For “The Walking Dead” is similar, in one game, significantly more than 50 enemy units were killed with the “Leaping Strike” ability, but the task was not completed.
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this is currently a known issue, hopefully the development team will fix this ASAP.
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This is finally fixed. it’s in the 5.0.4 known issues list post from Blizzard, under the ‘issues that should be resolved’ section of the linked post