Add achievements to the github auto-tagger.

.github/labeler.yml

@@ -1,3 +1,29 @@
+Achievements:
+  - src/achievements.hpp
+  - src/achievements.cpp
+  - src/gui/dialogs/achievements_dialog.hpp
+  - src/gui/dialogs/achievements_dialog.cpp
+  - data/achievements.cfg
+  - data/campaigns/Dead_Water/achievements.cfg
+  - data/campaigns/Delfadors_Memoirs/achievements.cfg
+  - data/campaigns/Descent_Into_Darkness/achievements.cfg
+  - data/campaigns/Eastern_Invasion/achievements.cfg
+  - data/campaigns/Heir_To_The_Throne/achievements.cfg
+  - data/campaigns/Legend_of_Wesmere/achievements.cfg
+  - data/campaigns/Liberty/achievements.cfg
+  - data/campaigns/Northern_Rebirth/achievements.cfg
+  - data/campaigns/Sceptre_of_Fire/achievements.cfg
+  - data/campaigns/Secrets_of_the_Ancients/achievements.cfg
+  - data/campaigns/Son_Of_The_Black_Eye/achievements.cfg
+  - data/campaigns/The_Hammer_of_Thursagan/achievements.cfg
+  - data/campaigns/The_Rise_Of_Wesnoth/achievements.cfg
+  - data/campaigns/The_South_Guard/achievements.cfg
+  - data/campaigns/tutorial/achievements.cfg
+  - data/campaigns/Two_Brothers/achievements.cfg
+  - data/campaigns/Under_the_Burning_Suns/achievements.cfg
+  - data/campaigns/Winds_of_Fate/achievements.cfg
+  - data/campaigns/World_Conquest/achievements.cfg
+
 Add-ons:
   - src/server/campaignd/**
   - src/server/common/**