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Just Keep Swimming
Successfully complete a Kobyss delve without ever losing your breath on Tier 8 or higher.
Just Keep Swimming requires you to complete a Kobyss delve (The Sinkhole or Tak-Rethan Abyss) on Tier 8 or higher without ever losing your breath, which is achieved by maintaining a permanent underwater breathing effect throughout the run.
Equip a water breathing item
Use one of the following to prevent your breath bar from appearing at all: equip a Mastercraft Kalu'ak Fishing Pole, wear a 
Shimmerscale Diving Helmet (note it lasts only 15 minutes, so slower runs may require more than one), or drink a 
Noggenfogger Elixir for its skeleton form, which grants underwater breathing.
Avoid breath-restoring bubbles
During your run in The Sinkhole, avoid interacting with or swimming through any air bubbles — touching them for the speed buff appears to interfere with the achievement triggering, so skip them entirely.
Complete the delve on Tier 8+
Run The Sinkhole or Tak-Rethan Abyss at Tier 8 or higher with your water breathing active and no breath lost; the achievement will complete at the end of a successful run.