feat(economy): add /achievements milestone badges

15 one-time achievements over the lifetime stat counters (work/wealth/gambling/
crime/heists/fishing/streaks/prestige), each paying a modest one-time coin reward
when unlocked. Detection is lazy - opening /achievements claims any newly earned
(like quests roll on view) - so no per-command hook is needed, and rewards are a
bounded, one-time coin source.

- New achievements.py: ACHIEVEMENTS table, pure newly_earned/achievements_view,
  and locked do_check_achievements. New achievements_earned schema field.
- /achievements command (own view claims; viewing others is read-only) with
  progress bars, db_error handling, and an "unlocked" banner.

8 tests: threshold detection, one-time claim (no double pay), multi-unlock,
view progress capping.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013VbAVsrZuYesea99mPMmPT

core/economy/achievements.py

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+"""Achievements: one-time milestone badges over the lifetime stat counters.
+
+Each achievement watches a monotonic stat the bot already tracks and unlocks once
+that stat crosses a threshold, paying a modest one-time coin reward. Detection is
+lazy: do_check_achievements is called when the player opens /achievements (like
+quests roll on view), so no hook is needed on every command. Rewards are bounded
+(each pays once) so this is a small, capped coin source.
+"""
+
+from __future__ import annotations
+
+from typing import TypedDict
+
+from ..pb_client import DatabaseError
+from .store import _commit, _locked_by, _txn, get_user
+
+__all__ = [
+    "Achievement",
+    "ACHIEVEMENTS",
+    "newly_earned",
+    "achievements_view",
+    "do_check_achievements",
+]
+
+
+class Achievement(TypedDict):
+    stat: str     # UserData counter this milestone watches
+    goal: int
+    name: str
+    emoji: str
+    reward: int   # one-time coin payout
+
+
+# Ordered roughly easy -> hard within each theme. Rewards scale with difficulty.
+ACHIEVEMENTS: dict[str, Achievement] = {
+    # Grind
+    "work_10":     {"stat": "work_count",        "goal": 10,     "name": "Töömesilane",        "emoji": "🐝", "reward": 250},
+    "work_100":    {"stat": "work_count",        "goal": 100,    "name": "Töönarkomaan",       "emoji": "🛠️", "reward": 1_500},
+    "beg_50":      {"stat": "beg_count",         "goal": 50,     "name": "Elukutseline kerjus", "emoji": "🥺", "reward": 500},
+    # Wealth
+    "earned_50k":  {"stat": "lifetime_earned",   "goal": 50_000, "name": "Jõukas",             "emoji": "💰", "reward": 1_000},
+    "earned_500k": {"stat": "lifetime_earned",   "goal": 500_000, "name": "TipiRIKAS",         "emoji": "🤑", "reward": 5_000},
+    # Gambling
+    "wager_10k":   {"stat": "total_wagered",     "goal": 10_000, "name": "Hasartmängur",       "emoji": "🎲", "reward": 750},
+    "wager_100k":  {"stat": "total_wagered",     "goal": 100_000, "name": "Kõrgete panuste mängija", "emoji": "🃏", "reward": 3_000},
+    "jackpot_1":   {"stat": "slots_jackpots",    "goal": 1,      "name": "Jackpot!",           "emoji": "🎰", "reward": 1_000},
+    # Crime & heists
+    "crime_25":    {"stat": "crimes_succeeded",  "goal": 25,     "name": "Kurjategija",        "emoji": "🦹", "reward": 1_000},
+    "heist_5":     {"stat": "heists_won",        "goal": 5,      "name": "Pangaröövel",        "emoji": "💣", "reward": 1_500},
+    # Fishing
+    "fish_25":     {"stat": "total_fish_caught", "goal": 25,     "name": "Kalur",              "emoji": "🎣", "reward": 500},
+    "fish_250":    {"stat": "total_fish_caught", "goal": 250,    "name": "Kalapüügimeister",   "emoji": "🐟", "reward": 3_000},
+    # Dedication
+    "streak_7":    {"stat": "best_daily_streak", "goal": 7,      "name": "Püsiv",              "emoji": "🔥", "reward": 500},
+    "streak_30":   {"stat": "best_daily_streak", "goal": 30,     "name": "Pühendunud",         "emoji": "🗓️", "reward": 2_500},
+    "prestige_1":  {"stat": "prestige_level",    "goal": 1,      "name": "Taassünd",           "emoji": "♻️", "reward": 2_000},
+}
+
+
+def _earned_ids(user) -> set[str]:
+    return set(user.get("achievements_earned") or [])
+
+
+def newly_earned(user) -> list[str]:
+    """Achievement ids whose threshold is met but which are not yet claimed."""
+    earned = _earned_ids(user)
+    return [
+        aid for aid, a in ACHIEVEMENTS.items()
+        if aid not in earned and int(user.get(a["stat"], 0) or 0) >= a["goal"]
+    ]
+
+
+def achievements_view(user) -> list[dict]:
+    """Display rows for every achievement: progress + earned flag (ordered as
+    defined, earned last so unfinished goals surface first)."""
+    earned = _earned_ids(user)
+    rows = []
+    for aid, a in ACHIEVEMENTS.items():
+        prog = int(user.get(a["stat"], 0) or 0)
+        rows.append({
+            "id": aid, "name": a["name"], "emoji": a["emoji"],
+            "goal": a["goal"], "reward": a["reward"],
+            "progress": min(prog, a["goal"]), "earned": aid in earned,
+        })
+    rows.sort(key=lambda r: r["earned"])  # unearned first
+    return rows
+
+
+@_locked_by(0)
+async def do_check_achievements(user_id: int) -> dict:
+    """Claim any newly-earned achievements and pay their one-time rewards."""
+    try:
+        user = await get_user(user_id)
+    except DatabaseError:
+        return {"ok": False, "reason": "db_error"}
+    new = newly_earned(user)
+    if not new:
+        return {"ok": True, "new": [], "reward": 0, "balance": user["balance"]}
+
+    earned = list(user.get("achievements_earned") or [])
+    total = 0
+    for aid in new:
+        earned.append(aid)
+        total += ACHIEVEMENTS[aid]["reward"]
+    user["achievements_earned"] = earned
+    user["balance"] += total
+    user["lifetime_earned"] = user.get("lifetime_earned", 0) + total
+    user["peak_balance"] = max(user.get("peak_balance", 0), user["balance"])
+    await _commit(user_id, user)
+    _txn("ACHIEVEMENTS", user=user_id, unlocked=",".join(new), reward=f"+{total}", bal=user["balance"])
+    return {"ok": True, "new": new, "reward": total, "balance": user["balance"]}