mods/HUD/mcl_achievements/init.lua

@@ -227,6 +227,13 @@ awards.register_achievement("mcl:whatAdeal", {
         icon = "mcl_core_emerald.png",
 })
 
+-- Triggered in mcl_fishing
+awards.register_achievement("mcl:fishyBusiness", {
+        title = S("Fishy Business"),
+        description = S("Catch a fish. \nHint: Catch a fish, salmon, clownfish, or pufferfish."),
+        icon = "mcl_fishing_fishing_rod.png",
+})
+
 -- NON-PC ACHIEVEMENTS (XBox, Pocket Edition, etc.)
 
 if non_pc_achievements then

mods/ITEMS/mcl_fishing/init.lua

@@ -75,6 +75,7 @@ local fish = function(itemstack, player, pointed_thing)
 									stacks_min = 1,
 									stacks_max = 1,
 								}, pr)
+								awards.unlock(player:get_player_name(), "mcl:fishyBusiness")
 							elseif r <= junk_value then
 								-- Junk
 								items = mcl_loot.get_loot({