feat: add endgame prestige and gold milestone achievements (#183, #185)

- Add prestige milestones at P50/P100/P150/P200 (10k/25k/50k/100k crystals)
- Add gold milestones at 1e30/1e60/1e90 (Cosmic Wealthy, Infinite Hoarder, Omniversal Tycoon)

apps/api/src/data/achievements.ts

@@ -149,7 +149,7 @@ export const defaultAchievements: Array<Achievement> = [
   },
   {
     condition:   { amount: 18, type: "bossesDefeated" },
-    description: "Defeat all 18 bosses across the first six zones.",
+    description: "Defeat the 18 bosses of the mortal realms.",
     icon:        "🌟",
     id:          "devourer_slayer",
     name:        "World Saver",
@@ -269,6 +269,33 @@ export const defaultAchievements: Array<Achievement> = [
     reward:      { crystals: 50_000 },
     unlockedAt:  null,
   },
+  {
+    condition:   { amount: 1e30, type: "totalGoldEarned" },
+    description: "Earn 1 nonillion gold in total.",
+    icon:        "🌌",
+    id:          "cosmic_wealthy",
+    name:        "Cosmic Wealthy",
+    reward:      { crystals: 100_000 },
+    unlockedAt:  null,
+  },
+  {
+    condition:   { amount: 1e60, type: "totalGoldEarned" },
+    description: "Earn a vigintillion gold in total.",
+    icon:        "♾️",
+    id:          "infinite_hoarder",
+    name:        "Infinite Hoarder",
+    reward:      { crystals: 250_000 },
+    unlockedAt:  null,
+  },
+  {
+    condition:   { amount: 1e90, type: "totalGoldEarned" },
+    description: "Earn a trigintillion gold in total.",
+    icon:        "🔮",
+    id:          "omniversal_tycoon",
+    name:        "Omniversal Tycoon",
+    reward:      { crystals: 1_000_000 },
+    unlockedAt:  null,
+  },
   // Higher quest milestones
   {
     condition:   { amount: 30, type: "questsCompleted" },
@@ -289,8 +316,8 @@ export const defaultAchievements: Array<Achievement> = [
     unlockedAt:  null,
   },
   {
-    condition:   { amount: 95, type: "questsCompleted" },
+    condition:   { amount: 122, type: "questsCompleted" },
-    description: "Complete all 95 quests across the known multiverse.",
+    description: "Complete all 122 quests across the known multiverse.",
     icon:        "🌌",
     id:          "quest_eternal",
     name:        "Quest Eternal",
@@ -363,4 +390,40 @@ export const defaultAchievements: Array<Achievement> = [
     reward:      { crystals: 25_000 },
     unlockedAt:  null,
   },
+  {
+    condition:   { amount: 50, type: "prestigeCount" },
+    description: "Prestige 50 times.",
+    icon:        "✨",
+    id:          "prestige_transcendent",
+    name:        "Transcendent",
+    reward:      { crystals: 10_000 },
+    unlockedAt:  null,
+  },
+  {
+    condition:   { amount: 100, type: "prestigeCount" },
+    description: "Prestige 100 times.",
+    icon:        "💎",
+    id:          "prestige_eternal",
+    name:        "Eternal Looper",
+    reward:      { crystals: 25_000 },
+    unlockedAt:  null,
+  },
+  {
+    condition:   { amount: 150, type: "prestigeCount" },
+    description: "Prestige 150 times.",
+    icon:        "🌟",
+    id:          "prestige_immortal",
+    name:        "Immortal Cycler",
+    reward:      { crystals: 50_000 },
+    unlockedAt:  null,
+  },
+  {
+    condition:   { amount: 200, type: "prestigeCount" },
+    description: "Prestige 200 times.",
+    icon:        "👑",
+    id:          "prestige_absolute",
+    name:        "Absolute Champion",
+    reward:      { crystals: 100_000 },
+    unlockedAt:  null,
+  },
 ];

apps/web/src/engine/tick.ts

@@ -476,8 +476,8 @@ export const computeProjectedRunestones = (state: GameState): number => {
     ? 1.5
     : 1;
   const runestoneMult = gain1Mult * gain2Mult;
-  /* eslint-disable-next-line @typescript-eslint/no-unsafe-assignment -- optional chained game state field */
+  const echoMult: number
-  const echoMult: number = state.transcendence?.echoPrestigeRunestoneMultiplier ?? 1;
+    = state.transcendence?.echoPrestigeRunestoneMultiplier ?? 1;
   return Math.floor(base * runestoneMult * echoMult);
 };