diff --git a/src/data/defs.txt b/src/data/defs.txt
index 194fcba..331e0c0 100644
--- a/src/data/defs.txt
+++ b/src/data/defs.txt
@@ -575,6 +575,7 @@ actor -300 0 40 suitv2
     id Drifter
     name "梓涵"
     chatid Drifter
+    chat_achievement no
     alive no
     wants maxvelocity none
     oxygen 0.08
@@ -755,6 +756,7 @@ actor 100 -18000 2000 clippy
         wants matchvelocitywith orbbusstopserenity
         name "Rudy"
         chatid NPCinCryoStasis
+        chat_achievement no
         pronoun he
 
 actor -184971e3 149410e3 -134273e3 clippy