diff --git a/forge-gui/src/main/java/forge/achievement/ArcaneMaster.java b/forge-gui/src/main/java/forge/achievement/ArcaneMaster.java
index 4978183ed56..27f66d4711a 100644
--- a/forge-gui/src/main/java/forge/achievement/ArcaneMaster.java
+++ b/forge-gui/src/main/java/forge/achievement/ArcaneMaster.java
@@ -1,6 +1,7 @@
 package forge.achievement;
 
 import forge.game.Game;
+import forge.game.GameType;
 import forge.game.player.Player;
 
 public class ArcaneMaster extends Achievement {
@@ -14,6 +15,9 @@ public class ArcaneMaster extends Achievement {
 
     @Override
     protected int evaluate(Player player, Game game) {
+        if (game.getRules().hasAppliedVariant(GameType.MomirBasic)) {
+            return defaultValue; // Momir Basic is exempt from this achievement (custom rules do not require any spellcasting by default)
+        }
         if (player.getOutcome().hasWon()) {
             return player.getAchievementTracker().spellsCast;
         }
diff --git a/forge-gui/src/main/java/forge/achievement/ChallengeAchievements.java b/forge-gui/src/main/java/forge/achievement/ChallengeAchievements.java
index 89ee82cc2f1..aa96d01a15c 100644
--- a/forge-gui/src/main/java/forge/achievement/ChallengeAchievements.java
+++ b/forge-gui/src/main/java/forge/achievement/ChallengeAchievements.java
@@ -2,6 +2,7 @@ package forge.achievement;
 
 import forge.deck.Deck;
 import forge.game.Game;
+import forge.game.GameType;
 import forge.game.player.Player;
 import forge.properties.ForgeConstants;
 
@@ -55,6 +56,10 @@ public class ChallengeAchievements extends AchievementCollection {
 
         @Override
         protected final boolean eval(Player player, Game game) {
+            if (game.getRules().hasAppliedVariant(GameType.MomirBasic)) {
+                // Momir Basic uses a fixed pre-defined deck format (all lands), so designing it to be that way is not the player's achievement
+                return false;
+            }
             if (player.getOutcome().hasWon()) {
                 return eval(player.getRegisteredPlayer().getDeck());
             }
diff --git a/forge-gui/src/main/java/forge/achievement/ManaFlooded.java b/forge-gui/src/main/java/forge/achievement/ManaFlooded.java
index 03d2435e103..5c528be1871 100644
--- a/forge-gui/src/main/java/forge/achievement/ManaFlooded.java
+++ b/forge-gui/src/main/java/forge/achievement/ManaFlooded.java
@@ -1,6 +1,7 @@
 package forge.achievement;
 
 import forge.game.Game;
+import forge.game.GameType;
 import forge.game.card.Card;
 import forge.game.player.Player;
 import forge.game.zone.ZoneType;
@@ -16,6 +17,9 @@ public class ManaFlooded extends Achievement {
 
     @Override
     protected int evaluate(Player player, Game game) {
+        if (game.getRules().hasAppliedVariant(GameType.MomirBasic)) {
+            return 0; // in Momir Basic, getting a lot of lands out is not an achievement:w
+        }
         if (player.getOutcome().hasWon()) {
             int landCount = 0;
             for (Card c : player.getZone(ZoneType.Battlefield).getCards()) {